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STEM Minute airs Fridays at 3:04pm ET on 88.9 WFSU-FM.

If you have a question, please email minutes@wfsu.org. Please reference STEM Minute in the subject line of your message.

Question Archive

Exoplanets: Worlds Beyond Our Solar SystemMay 29, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is exoplanets, worlds beyond our solar system. Exoplanets are planets that orbit stars beyond our own sun, and we've already discovered more than 5,000 of them and counting. The first confirmed discoveries came in the 1990s, and since then, missions like Kepler and Tess have revealed a galaxy filled with diverse worlds, hot Jupiters, super-earth, and even planets orbiting two stars. But how do we find them? One common method is the transit technique. When a planet passes in front of its star, it causes a tiny dip in brightness. By measuring that dip, scientists can determine the planet's size and orbit. Another method tracks the subtle wobble of a star caused by a planet's gravity. Some exoplanets lie in the habitable zone, where conditions might allow liquid water and possibly even life. Because somewhere out there orbiting a distant star could be a world not so different from our own.
CRISPR: Editing the Code of LifeMay 22, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansi and the Director of the Challenger Learning Center of Tallahassee, and today STEM Minute topic is CRISPR, editing the code of life. CRISPR is a revolutionary technology that allows scientists to edit DNA with precision, almost like using a pair of molecular scissors. Originally discovered as part of a bacterial immune system, CRISPR helps microbes defend themselves against viruses by cutting up foreign genetic material. Scientists realize they could harness this system to target and modify specific genes and plants, animals, and even humans. The process uses a guiding molecule to locate a precise DNA sequence, and an enzyme, often called Cas9, to cut the DNA at that exact spot. From there, genes can be removed, repaired, or replaced. CRISPR has enormous potential. It's being explored to treat genetic diseases, improve crops, and even fight cancer. But it also raises important ethical questions about how far we should go in editing life. From bacteria to breakthrough medicine, CRISPR is transforming biology, one gene at a time. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Hydrogen: The Universe’s First ElementMay 15, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today, STEM Minute topic is Hydrogen, the universe's first element. Hydrogen is the simplest and most abundant element in the universe. Each atom has just one proton and one electron, making it the building block for everything from stars to water. Form just moments after the Big Bang, hydrogen fuels the universe. Inside stars, including our Sun, hydrogen atoms undergo nuclear fusion, combining to form helium and releasing enormous amounts of energy, the light and heat that sustain life on Earth. On air planet, hydrogen is rarely found alone. It bonds easily with other elements, most famously forming H2O, water. It's also used in industry from refining fuels to producing fertilizers. Today, hydrogen is gaining attention as a clean energy source. In fuel cells, hydrogen combines with oxygen to produce electricity, with water is the only byproduct. From the birth of the universe to the future of energy, hydrogen is proof that the simplest element can have the biggest impact. Listen to archives of STEM Minute at WFSU.org-slash-stem-minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Helicopters: Mastering Lift in MotionMay 8, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute Topic is Helicopters, Mastering Lift and Motion. Helicopters do something most aircraft can't. They hover. That ability comes down to clever engineering and a deep understanding of aerodynamics. The idea dates back to the 1400s when Leonardo Da Vinci sketched an aerial screw, an early concept for vertical flight. It never flew, but it showed that spinning surfaces could generate lift. The first practical helicopter arrived in 1939, developed by aviation pioneer Igor Sikorsky, whose design shaped modern rotor craft. Instead of fixed wings, helicopters use rotating blades, called a rotor to generate lift, even without forward motion. But hovering introduces a challenge, torque. As the main rotor spins, the body wants to rotate the opposite way. A tail rotor counters that force, keeping the aircraft stable. From Da Vinci sketches to modern rescue missions, helicopters prove that sometimes flight isn't about moving forward, it's about staying exactly where you need to be.
Plutonium: Power and PerilMay 1, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Plutonium, Power and Parallel. Plutonium is one of the most powerful and controversial elements on Earth. It doesn't occur naturally in significant amounts, it's created in nuclear reactors when uranium absorbs neutrons. Discovered in 1940 by a team led by Glenn Seaborg, Plutonium quickly became central to both nuclear energy and nuclear weapons. Its most important isotope, Plutonium 239, can sustain a chain reaction, releasing enormous amounts of energy. That same property makes Plutonium useful beyond weapons. It's used in radioisotope thermoelectric generators or RTGs, which power spacecraft like Voyager and Curiosity, converting heat from radioactive to K into electricity. Plutonium is also highly toxic and radioactive, requiring careful handling and long-term storage. It's an element of extremes, capable of powering missions to the edge of the solar system or reshaping history here on Earth. With Plutonium, science reveals both its greatest potential and its greatest responsibility. Listen to archives of STEM Minute at WFSU.org-slash-STEM-MINUT. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Tires: Where the Rubber Meets the RoadApril 24, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Tires, where the rubber meets the road. Tires may look simple, but there are sophisticated blend of material, science, and engineering. Early vehicles rolled on solid wooden or metal wheels, which were durable but rough. In the 1800s, solid rubber tires improved comfort, but the real breakthrough came with the pneumatic air-filled tire, enabling smoother rides and better traction. Today's tires are made from natural and synthetic rubber, reinforced with steel belts and fabric layers. Their tread patterns are engineered to channel water away, improving grip and reducing hydroplaning, while air pressure ensures proper contact with the road. Looking ahead, engineers are developing airless tires, self-healing materials, and even smart tires that monitor road conditions in real time. From rigid wheels to intelligent systems, tires continue to evolve, because every journey depends on staying connected to the road, now and into the future. WWFSU
Space Junk: The Growing Traffic in OrbitApril 17, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Space Junk, the Growing Traffic in Orbit. Earth's orbit isn't empty, it's filled with thousands of satellites, and millions of pieces of space debris, often called space junk. This debris includes defunct satellites, fragments from rocket launches, and pieces created by past collisions. Even something as small as a paint ship can be dangerous, because objects in orbit travel at over 17,000 miles per hour. To keep track of it all, the U.S. Space Force operates the Space Surveillance Network, a global system of radar and telescopes that monitors tens of thousands of objects in orbit. NASA's Orbital Debris Program Office studies how debris forms and how spacecrafts can avoid it. Scientists are also exploring ways to clean up orbit, such as drag sales that help satellites burn up in the atmosphere, or robotic missions designed to capture space debris. Because space may be vast, but the orbital highways around the Earth are getting crowded. Listen to archives of STEM Minute at WFSU.org-slash-stem-minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Pollen: Nature’s Tiny MessengersApril 10, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is, Paulin, Nature's Tiny Messengers. Paulin may seem like just a yellow dust that coats your car and spring, but it plays a vital role in plant reproduction. Paulin grains are the male reproductive cells of flowering plants. Each grain carries genetic material that must reach the female part of a plant to produce seeds. To get there, plants rely on pollinators like bees, butterflies, birds, and even the wind. Under a microscope, Paulin is surprisingly complex. Each grain has a tough outer shell called sporo-pollininin, one of the most durable natural materials known. This protective layer allows Paulin to survive harsh conditions while traveling between plants. Scientists can even study ancient Paulin, trapped in sediments and ice cores to reconstruct past climates and ecosystems, a field known as paleonology. So while Paulin might trigger seasonal allergies, it's also a microscopic career carrying the genetic future of forests, flowers, and food crops around the world. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Saturn: The Ringed GiantApril 3, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the Fam U FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Saturn, the Ring Giant. Saturn is one of the most recognizable planets in our solar system, famous for its stunning rings. These rings are made of billions of particles of ice and rock, ranging in size from tiny grains to chunks as large as mountains. Saturn is a gas giant composed mostly of hydrogen and helium, and it's the second largest planet after Jupiter. Despite its enormous size, Saturn is surprisingly light, so light that if you could find a bathtub big enough, Saturn would float in water. The rings aren't static, small, shepherd moons help shape and maintain them through gravity. One of the most unusual is Pan, a tiny moon with a bulging equator that makes it look like a flying ravioli. NASA's Cassini spacecraft, which orbited Saturn for 13 years, revealed remarkable details about the rings, storms, and moons. Saturn isn't just beautiful, it's a natural laboratory for understanding how planets and solar systems form. Listen to archives of STEM Minute at WFSU.org-slash-stem-minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
The Mouse: Pointing the Way to the Digital AgeMarch 27, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, The Mouse, pointing the way to the digital age. The computer mouse may seem simple today, but it transformed how humans interact with machines. It was invented in 1964 by Douglas Engelbart at the Stanford Research Institute. His original prototype was a small wooden box with two wheels that translated hand movement into cursor motion. The cord trailing behind it inspired the name Mouse. The idea gained traction in the 1970s at Xerox Park, where researchers paired it with a graphical interface, windows, icons, and clickable menus. Apple later helped bring the mouse into homes around the world, first with Alisa, and then with the Macintosh. Early versions used a rolling ball. Today's mice rely on optical and laser sensors, tiny cameras that track motion with remarkable precision. From a wooden block to a wireless precision tool, the mouse didn't just move a cursor, it moved us into the digital age. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Self-Driving Cars: Steering Into the FutureMarch 20, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Self-Driving Cars Steering Into the Future. Self-driving cars aren't powered by magic, they're powered by sensor, software, and artificial intelligence. The technology traces back to the early 2000s when the US Defense Advanced Research Project Agency, DARPA, launched a series of autonomous vehicle challenges. Teams competed to build cars that could navigate desert terrain without a driver. Those competitions jumped started today's Self-Driving Revolution. Modern autonomous vehicles use a blend of cameras, radar, and light-art laser-based sensors to map their surroundings in real-time. On-board computers process enormous amounts of data each second, identifying lanes, pedestrians, and other vehicles. At the core is machine learning, trained on millions of miles of driving data to make split-second decisions. Most cars today offer driver-assistant systems, but fully autonomous vehicles are still evolving. From DARPA's desert races to city streets, Self-Driving Cars show how robotics and AI are reshaping the future of transportation.
Pluto: The Planet That Changed the RulesMarch 13, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the Fam U FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today STEM Minute topic is Pluto, the planet that changed the rules. Pluto was discovered in 1930 by Clyde Tombow, and it quickly captured the public imagination. It was named by an 11-year-old British girl, Venetia Bernie, who suggested Pluto after the Roman God of the Underworld, a fitting name for a dark distant world. The symbol for Pluto even incorporates the initial C NT for Tombow. Tombow passed away in 1997, but part of his ashes actually flew on the new horizon spacecraft when it visited Pluto in 2015. For decades, Pluto was considered the ninth planet, but in 2006, astronomers reclassified it as a dwarf planet because it shares its orbital neighborhood with other icy objects in the Kuiper Belt and has it cleared its own orbit. Despite the change, Pluto remains fascinating. It has five moons, including the large companion Karon, and in 2015, NASA's New Horizons revealed mountains of water ice and frozen nitrogen planes. Pluto may no longer be a planet, but it helped redefine what a planet really is. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Radio Telescopes: Listening to the UniverseMarch 6, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is radio telescopes listening to the universe. When most people picture a telescope they imagine mirrors and visible light, but radio telescopes don't look at the universe, they listen to it. Instead of collecting visible light, radio telescopes detect radio waves emitted by objects like pulsars, distant galaxies, and clouds of hydrogen gas. These signals are incredibly faint, so astronomers build massive dish antennas together as much data as possible. Radio astronomy began in 1932 when Carl Janski accidentally detected radio waves coming from the center of our galaxy. Soon after, Grote the Reiber built the first purpose-built radio telescope in his backyard. One of the most famous examples today is the very large array, or VLA, in New Mexico, a network of 27 giant radio dishes spread across the desert, made famous by the movie Contact. The universe isn't silent, it's broadcasting. We just have to know how to tune in. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. And provided is the opinion of the sponsor and not of WFSU.
Bridges: Where Engineering Meets GravityFebruary 27, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Bridges, where engineering meets gravity. Bridges are more than roadways in the sky, they're masterpieces of civil engineering. Their job is simple, carry weight, safely across obstacles like rivers, valleys, or highways. But the physics behind that job is anything but simple. Civil engineers design bridges to manage tension and compression, the forces that pull and push on materials. In a beam bridge, weight pushes downward while supports carry the load. In a suspension bridge, cables handle tension, distributing weight across towers and anchor points. Arch bridges shift forces outward and downward, using compression to stay strong. Engineers must also account for wind, temperature changes, earthquakes, and traffic loads. Modern bridges rely on advanced materials like reinforced concrete and high-strend steel, along with computer modeling to test safety before construction begins. From small foot bridges to massive spans like the Golden Gate, Bridges connect communities, and showcase the precision, creativity, and problem-solving power of civil engineers. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Cardboard: Engineering in a BoxFebruary 20, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Cardboard, Engineering in a Box. Cardboard may seem simple, but it's a clever piece of engineering. Most chipping boxes are made from corrugated fiberboard, a sandwich of three layers, a flat liner, a wavy middle layer called the flute, and another flat liner on top. That wavy flute is the secret. Its arches create strength and rigidity while keeping the material lightweight. The design distributes weight evenly, allowing boxes to stack without collapsing. It's the same structural principle used in arches and bridges. Cardboard is typically made from wood pulp, often recycled multiple times. Engineers test it for compression strength, burst resistance, and moisture tolerance to ensure it protects everything from cereal to spacecraft components. Packaging science goes even further. Designers consider shock absorption, temperature control, and sustainability. From warehouse shelves to your doorstep, Cardboard proves that even a simple box is a product of material science, structural engineering, and smart design. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
DNA: The Code of LifeFebruary 13, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the Fam U FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. Today's STEM Minute topic is DNA, the Code of Life. DNA, short for deoxyribonucleic acid, is the instruction manual for every living organism on Earth. It tells cells how to grow, function, and reproduce, all using a chemical code written in just four letters, A, T, C, and G. DNA is shaped like a double helix, often compared to a twisted ladder. The sides are made of sugar and phosphate molecules, while the rungs are pairs of bases. A always pairs with T and C with G. This simple pairing allows DNA to be copied accurately every time a cell divides. In 1953, scientists James Watson and Francis Crick, building on crucial work by Rosalyn Franklin, uncovered DNA structure, unlocking modern genetics. DNA influences everything from eye color to disease risk. By reading and editing this code, scientists can study evolution, solve crimes, develop medicines, and even explore how life might exist beyond Earth. All of life's complexity, written in a molecule so small, you can't see it. Content provided is the opinion of the sponsor and not of WFSU.
Maple Syrup: From Tree to TableFebruary 6, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Maple Syrup, SEP, Science and Sweetness. Maple Syrup is more than just a breakfast favorite. It's a marvel of chemistry and patience. Real Maple Syrup begins as a SEP, tapped from sugar maple trees during early spring, and fluctuating temperatures help push the SEP out of the tree. The SEP is about 98% water. To make syrup, it's boiled down to concentrate the sugars and develop flavor. It takes about 40 gallons of SEP to produce just one gallon of syrup. During this process, sugars caramelize, creating the syrup's signature taste and amber color. Unlike imitation syrups, which are often just corn syrup and flavoring, real maple syrup contains dozens of unique compounds, including antioxidants and trace minerals. At the Challenger Learning Center, we love using everyday favorites like maple syrup to show how chemistry, climate and biology all come together in a tasty example of STEM in action. From forest to flapjack, maple syrup is a sweet science you can pour. Listen to archives of STEM Minute at wfsu.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. It provided is the opinion of the sponsor and not of WFSU.
Gunpowder: The Chemistry That Changed the WorldJanuary 30, 2026
Transcript
STEM Minute has made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Gunpowder, the chemistry that changed the world. Gunpowder, also called Blackpowder, is one of the earliest known chemical explosives, and it changed history. Invented in 9th century China, it was originally created by alchemists seeking an elixir of immortality. Instead, they discovered a powerful mixture that could propel projectiles and cause explosions. The classic recipe combines salt, Peter, potassium nitrate, charcoal, and sulfur. When ignited, the nitrate provides oxygen to rapidly burn the fuel, releasing hot gases and expanding rapidly, resulting in an explosion. Gunpowder revolutionized warfare, mining, and construction. It powered cannons, rifles, and early rockets, spreading across the world through trade and conquest. Though it's largely been replaced by modern smokeless powders, Gunpowder laid the foundation for ballistics, rocketry, and pyro-technics. What began as a quest for eternal life ended up igniting a technological revolution, a combustible blend of chemistry, curiosity, and unintended consequences.
Mercator Projection: Mapping a Round World FlatJanuary 23, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, the Mercator Projection, mapping a round-world flat, flattening a globe onto a map is no easy feat. One of the most famous and controversial attempts is the Mercator Projection, created by Flemish cartographer Gerardis Mercator in 1569. Mercator's innovation was brilliant for navigation. It preserves angles, meaning compass bearing stay true, an essential feature for early sailors plotting straight line courses across the seas. But there's a trade-off, distortion. Near the equator, countries look relatively accurate, but closer to the poles, landmasses balloon in size. Greenland appears as big as Africa, even though Africa is 14 times larger. Despite its flaws, the Mercator Projection became the standard for nautical maps and even online tools like early Google Maps. Today, geographers often use alternative projections, like the Robin Center Gal Peters, that better reflect size and area. Still, Mercator's projection reminds us every map is a choice in how we represent the world, shapes how we see it. Mercator Projection is the opinion of the sponsor and not of WFSU.
Escape VelocityJanuary 16, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, Escape Velocity, Breaking Free From Earth. To leave Earth behind, you need more than fuel, you need speed. Escape Velocity is the minimum speed required to overcome a planet's gravity without falling on Earth, that means traveling at about 11.2 kilometers per second, or nearly 25,000 miles per hour. This is different from suborbital flights, like those offered by some space tourism companies, which shoot straight up and fall back down. They experience space briefly but never achieve the sustained speed needed to orbit the planet. Orbital and deep space missions, however, must reach or exceed escape velocity to stay in orbit, or to head towards the moon or Mars. The math behind this comes from balancing kinetic energy against gravitational pull. Whether launching a satellite or a spacecraft, beating gravity starts with a number, and that number is Escape Velocity.
OctaneJanuary 9, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Octane, Fuel for Thought. When you pull up to the pump and see 87, 89 or 93, you're choosing a fuels Octane rating, a measure of how well it resists engine knocking or premature combustion. It's not about energy content, but stability. The number is based on a scale where ISO Octane, which resists knocking, is rated 100 and HEPTAIN, which knocks easily is rated zero. Regular gas is usually 87, while 93 is a high performance option. Mid-grade 89? It's often just a mix of the two. European countries use a similar system, but report a slightly different value. The run or research octane number, which typically reads higher than the US anti-knock index. For example, Europe's 95 Ron is about the same as America's 91 A.K.I. Octane ratings may seem small, but they're critical to keeping your engine running smoothly, where chemistry meets combustion, one number at a time. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. And provided is the opinion of the sponsor and not of WFSU.
Bird CallsJanuary 2, 2026
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Bird Calls, Nature's Musical Signals. Not all birds sing, but nearly all communicate through sound. Some vocalizations are short calls, used to warn of danger, stay in touch with the flock or signal aggression. Birds are longer, more musical songs often used by males to defend territory or attract mates. These sounds aren't made with vocal cords like ours, birds have a special organ called the Syrinks. Located deep in the chest, where the windpipe splits, allowing them to produce complex, even simultaneous notes. Thanks to science, you can now identify bird sounds with just your phone. The free Merlin app from the Cornell Lab of Ornithology listens in real time and tells you what birds you're hearing, great for backyards or hikes. So the next time you hear chirps, tweets or warbles, you're eavesdropping on one of nature's oldest communication systems, powered by lungs, serencs, and millions of years of evolution. Listen to archives of STEM Minute at wfsu.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Cement: The Science Behind the StoneDecember 26, 2025
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is cement, the science behind the stone. Cement is one of the most widely used building materials on Earth, but it's not the same as concrete. Cement is the ingredient that binds concrete together. Early forms of cement date back to ancient civilizations, the Romans famously used volcanic ash to make post-alonic cement, which helped their structures like the Pantheon and Aqueduct stand for millennia. Modern Portland cement developed in the 19th century and proved on this legacy with even greater strength and consistency. Today, Portland cement is made by heating limestone and clay to around 2700 degrees Fahrenheit in a rotary kiln, producing clinker. The clinker is ground into fine powder and blended with gypsum. When water is added, a chemical reaction called hydration begins. Forming a hardened material that doesn't just dry, it bonds at the molecular level. It may seem ordinary, but cement is a triumph of chemistry and engineering. From Roman runes to modern cities, it's the stuff that holds civilization together. Literally. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Solar Panels: Turning Light into PowerDecember 19, 2025
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM outreach program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the director of the Challenger Learning Center of Tallahassee, and today STEM Minute topic is solar panels turning light into power. Solar panels are a powerful example of how science transforms sunlight into electricity. At the heart of each panel are photovoltaic cells, usually made from silicon. When sunlight hits the cell, photons from the light knock electrons loose from atoms. This movement of electrons creates an electric current, a process known as the photovoltaic effect. Solar panels produce direct current, DC electricity, which is then converted into alternating current AC by an inverter, making it usable for homes, schools, and even spacecraft. While the idea of using sunlight for power dates back to the 1800s, modern solar cells were first developed in the 1950s for satellites. Since then, they've become more efficient, affordable, and widespread. Today, solar panels are used in everything from rooftop home systems and giant solar farms to calculators, satellites, and water pumps. Anywhere reliable, clean power is needed. From deep space to your backyard, it all starts with the spark of sunlight. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
The Metric System: Base Ten BrillianceDecember 12, 2025
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is the metric system, based 10 brilliance. Meaders, leaders, grams, it's all part of the metric system, a universal language of measurement used by almost every country on Earth. Created during the French Revolution in the late 1700s, the metric system was designed to be simple, consistent, and based on natural constants. Unlike older systems with arbitrary units like feet or gallons, metric units scale by powers of 10, making conversions a matter of shifting a decimal point. Today's version, the International System of Units, includes seven base units like the meter-for-length and the second for time. Modern definitions are incredibly precise, like defining the kilogram based on Planck's constant instead of a physical object. The US still uses customer units in daily life, but science, medicine, and engineering rely on metric standards. From nanometers in a computer chip to kilometers between planets, the metric system helps us measure the world and beyond, with clarity and consistency. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Vera Rubin: Mapping the DarkDecember 5, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is, Vera Rubin, Mapping the Dark. Nestled in the Chilean Andes, the Vera C. Rubin Observatory is poised to revolutionize astronomy. Named after the pioneering astrophysicist who confirmed the existence of dark matter, the observatory will conduct the legacy survey of space and time, or LST, a 10-year effort to capture the entire southern sky in stunning detail every few nights. At the heart of this facility is the Simone Survey Telescope, equipped with the largest digital camera ever built for astronomy, a 3.2 gigapixel marvel. That's enough resolution to spot a golf ball from 15 miles away. By gathering petabytes of data, the Rubin Observatory will help scientists study dark energy, crack asteroids, and even detect exploding stars in real time. It's a cosmic time lapse on an unprecedented scale. Vera Rubin once said, we live in a universe whose age we can compute, whose history we can imagine. Now, her namesake observatory helps us see it too. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. And provided is the opinion of the sponsor and not of WFSU.
Laser Printers: Light Writing with PrecisionNovember 28, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, laser printers, light writing with precision. Laser printers don't use ink like traditional printers, they use science. At the core of a laser printer is a photo-conductive drum that holds an electrostatic charge. A laser beam draws the image or text by selectively discharging parts of the drum, creating an invisible pattern of static electricity. Think of it like writing with light. Then comes the toner, a fine colored powder. The charged areas of the drum attract toner particles, which are then transferred onto paper. A fuser unit uses heat and pressure to melt the toner, fusing it permanently to the page. This process happens in a fraction of a second, and results in crisp, fast prints, ideal for offices and high-volume environments. Invented at Xerox in the 1970s, laser printing blends optics, electrostatics, and thermodynamics into one seamless technology. So every time you print, remember, it's a light show you'll never see. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Marshmallows: Sweet ChemistryNovember 21, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Marshmallows Sweet Chemistry. Fluffy, sticky, and irresistibly sweet, Marshmallows are more than just a treat. There are a showcase of chemistry and action. Originally, Marshmallows were made from the Marshmallow plant, whose sap was whipped with honey for medicinal sweets in ancient Egypt. Today's version skipped the plant, but keep the name and introduce science into the mix. Modern Marshmallows are made by whipping sugar, water, and gelatin with air. Gelatin, a protein from animal collagen, forms a flexible matrix that traps bubbles and creates that pillowy texture. The process is a lesson in colloids, where gas is suspended in a solid. When you toast a Marshmallow, you're triggering the myard reaction, a chemical dance between sugars and proteins that gives brown food its rich, complex flavor. So next time you roast one over a campfire, remember, you're not just making s'mores, you're experimenting with edible science. Content provided is the opinion of the sponsor and not of WFSU.
The Internet: The Web That Connects Us AllNovember 14, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM outreach program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the director of the Challenger Learning Center of Tallahassee. Today, STEM Minute topic is the Internet, the web that connects us all. The Internet is in a single thing, it's a vast network of networks linking billions of devices across the globe. It works by breaking information into data packets, sending them across fiber optics, cables and satellites, and reassembling them in real time. Its roots go back to the 1960s with ARPINET, a US military project that proved long distance computer communication was possible. But the Internet, as we know it, didn't take off until 1991, when Tim Berners-Lee, working at CERN, invented the World Wide Web, a way to link in browse content using hyperlinks. Today, technologies like IP addresses, DNS, and encryption protocols keep the Internet running quietly behind the scenes. It powers everything from streaming and banking to global science and emergency response. What began as a military experiment and a physicist's idea now shapes how the entire planet connects, learns and communicates. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Yeast: Tiny Organisms, Big ImpactNovember 7, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is East. Tiny organisms, big impact. East may be microscopic, but its impact on science, food, and medicine is enormous. In baking, East feeds on sugars in dough, producing carbon dioxide that causes bread to rise. That same fermentation process is used in making beer and wine, turning sugar into alcohol, something humans have relied on for thousands of years. But East isn't just a kitchen helper. In 1928, Alexander Fleming discovered penicillin, the first reliant of iotic, by observing mold. Later, East and other fungi played a major role in helping scientists mass-produce life-saving medicines, from antibiotics to insulin. Because it shares many cellular traits with humans, East is also a powerful tool in research labs. It's used to study genetics, aging, and even disease. In 1996, East was the first organism to have its entire genome sequenced. Whether it's lifting your sandwich bread, brewing your coffee stout, or helping cure infections, East proves that even the smallest life forms can play a massive role in the world of STEM. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Chocolate: Sweet Science in Every BiteOctober 31, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Chocolate, Sweet Science in Every Bite. Chocolate isn't just delicious, it's a perfect blend of chemistry, botany, and history. It starts with a Theobromo cacao tree, whose seeds, cacao beans, are fermented, dried, roasted, and ground into a thick paste. When mixed with sugar, milk, and cocoa butter, the bitter base becomes the smooth chocolate we love today. But chocolate's story began long before modern candy bars. Ancient cultures like the Olmex, Maya, and Aztecs consume cacao as a spiced bitter drink, often used in sacred rituals or even as currency. When Europeans encountered cacao in the 1500s, they added sugar, turning it into a sweet indulgence, and launching centuries of chocolate innovation. And chocolate relies on a process called tempering, where cocoa butter is crystallized for that signature glossy look and snap. Chocolate also contains compounds like triptophan that can lift your mood. It's a science you can taste with every bite.
Batteries: From Frogs to Fast ChargingOctober 24, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Batteries from Frogs to Fast Charging. The story of battery starts in the 18th century, when Luigi Galvani discovered that Frogs legs twitched in response to electricity. Inspired by this, Alessandro Volta built the first true battery in 1800, the Voltaic Pile, using stacked metals and salty cloth to produce continuous electric current. Batteries evolved through the 19th and 20th centuries, powering everything from telegraphs to flashlights. The alkaline battery introduced in the 1960s became a household standard. Today, lithium ion batteries power phones, laptops, and electric cars, lightweight, rechargeable, and high energy. But the future looks even brighter. Solid state batteries using solid electrolytes, promise greater energy density, faster charging, and improve safety. Scientists are also exploring sodium ion and aluminum air batteries as more sustainable abundant alternatives. From metal plates to cutting edge materials, batteries continue to shape how we live, travel, and communicate, quietly powering the world behind the scenes. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
The Tree of Life: Understanding TaxonomyOctober 17, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is, Taxonomy, Naming Life. Taxonomy is the science of classifying living things, a way to bring order to the incredible diversity of life on Earth. From microscopic bacteria to blue whales, taxonomy organizes organisms into groups based on shared characteristics. The modern system began with Carl Leneas in the 18th century. He introduced by Nomeal Nomenclature, the two-part Latin naming system we still use today. For example, domestic cats are Fielis Catus. Life is classified into a hierarchy. Domain, kingdom, phylum, class, order, family, genus, and species. This branching structure helps us understand how organisms are related through revolution and shared ancestry. Advancements in genetics and molecular biology now allow scientists to classify life based on DNA, leading to some surprising reclassifications, like grouping whales closer to hippos than fish. Taxonomy is more than naming. It's about finding our place in the living web of Earth's history. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Digital Cameras: From Light to CodeOctober 10, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM outreach program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the director of the Challenger Learning Center of Tallahassee, and today STEM Minute topic is Digital Cameras from Light to Code. Before digital cameras, light-sensitive film chemically reacted to light to record an image. Today, we use semiconductors and image sensors instead. At the heart of a digital camera is a sensor containing millions of tiny pixels. When you take a photo, the lens focuses light onto the sensor. Each pixel detects incoming photons, converting them into electrical signals, and sends that data to be digitally processed. To capture color, cameras use a buyer filter, named after Bryce E. Byer, the codex scientist who invented this color pattern. Each pixel detects either red, green, or blue light, and software reconstructs a full color image from that data. Miniaturization has allowed this technology to fit in the palm of your hand, and this blend of physics, optics, and computing turns fleeting light into vivid memories. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
The Sun: Our Living StarOctober 3, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is, the Sun, our Living Star. The Sun is a massive ball of plasma, made mostly of hydrogen and helium, and it sits at the center of our solar system, holding everything in orbit with its immense gravitational pull. At about 93 million miles away, it seems distant, but it drives weather, climate, and life on Earth. Inside the Sun, nuclear fusion converts hydrogen into helium, releasing vast amounts of energy. Every second, it emits more power than humans have used in all of history. That energy takes eight minutes to travel to Earth as sunlight, warming the planet and fueling photosynthesis and plants. The Sun is about 4.6 billion years old, and roughly halfway through its life cycle. One day, it will expand into a red giant, before eventually collapsing into a white dwarf. Though we often take it for granted, the Sun is a dynamic, ever-changing star, and without it, there would be no life on Earth. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor, and not of WFSU.
The Moon: Earth’s Celestial CompanionSeptember 26, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is The Moon, Earth's Celestial Companion. The Moon is Earth's only natural satellite orbiting about 240,000 miles away. Though it's just over a quarter the size of Earth, its influence is enormous. It drives the ocean tides, stabilizes our planet's axial tilt, and has guided human calendars and navigation for millennia. Formed about 4.5 billion years ago, scientists believe the Moon was created when a Mars-sized object collided with Earth, ejecting debris that eventually coalesced into the Moon we see today. The Moon's surface is marked by impact craters, lava planes, and towering mountains. With no atmosphere to protect it, its temperature swings from negative 280 degrees Fahrenheit at night to 260 degrees Fahrenheit in sunlight. In 1969, humans first set foot on the Moon, and today, new missions are planning a return. NASA's Artemis program aims to establish a sustained presence, turning our oldest neighbor into a stepping stone for deeper space exploration. The Moon, ancient, silent, and still full of mysteries. Content provided is the opinion of the sponsor and not of WFSU.
pH: Measuring Acidity, One Ion at a TimeSeptember 19, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, pH, measuring acidity, one ion at a time. pH is a scale used to measure how acidic or basic a substance is. It ranges from zero to 14 with seven being neutral, like pure water. It ranges below seven or acidic, like lemon juice or stomach acid, while values above seven or basic, like baking soda or soap. The concept was introduced in 1909 by Soren Sorensen, a Danish chemist at the Carlsberg Laboratory, and it reflects the concentration of hydrogen ions in a solution. The more hydrogen ions, the lower the pH and the stronger the acid. It's a logarithmic scale, so a pH of three is ten times more acidic than a pH of four. pH plays a vital role in biology, chemistry, agriculture, and even environmental science. Our blood, for instance, stays around a pH of 7.4, just slightly basic, and even small changes can be life-threatening. So the next time you drink orange juice or clean with vinegar, you're interacting with the power of pH. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. And provided is the opinion of the sponsor and not of WFSU.
Chlorophyll: The Green Engine of LifeSeptember 12, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Telehassy, the K-12 STEM Outreach Program of the Fam U FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Telehassy, and today's STEM Minute topic is chlorophyll, the Green Engine of Life. Chlorophyll is the green pigment found in plants, algae, and some bacteria, and it's absolutely essential for photosynthesis, the process that converts sunlight into energy. Without chlorophyll, plants couldn't make their own food and life on Earth, as we know it, wouldn't exist. Inside plant cells, chlorophyll is stored in structures called chloroplasts. When sunlight hits a leaf, chlorophyll absorbs mostly blue and red wavelengths of light, reflecting green, which is why most plants appear green to our eyes. The energy absorbed by chlorophyll powers a chain of reactions that convert carbon dioxide and water into glucose. A form of chemical energy plants used to grow. Oxygen is released as a byproduct, which fills the atmosphere and fuels animal life. Chlorophyll doesn't just power plants, it powers ecosystems, agriculture, and the air we breathe. It's a microscopic molecule with a massive impact, capturing sunlight to keep Earth's life systems running. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Spiders; The Engineers of the WebSeptember 5, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today STEM Minute topic is Spiders, Engineers of the Web. Spiders are a racknet, not insects, with eight legs, multiple eyes, and an evolutionary history stretching back over 300 million years. With more than 45,000 known species, Spiders have adapted to nearly every environment on Earth, deserts, forest caves, and even underwater. What makes Spiders truly remarkable is their ability to produce silk, a protein-based material that's stronger, ounce frowns, than steel. Spiders use silk for a variety of purposes, to build webs, rat prey, protect eggs, and even balloon through the air by riding wind currents. Spiders are skilled hunters, some build intricate webs to trap prey while others actively stalk or ambush their targets, most use venom to immobilize insects, making them vital to controlling pest populations. Despite their fearsome reputation, Spiders are mostly harmless to humans, and play a crucial role in ecosystems worldwide. They're tiny, silent, and often misunderstood, but Spiders are brilliant builders and essential predators. Listen to archives of STEM Minute at WFSU.org-STAM-MINUT. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Volcanoes: Pressure, Power and Planetary ChangeAugust 29, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is Volcanoes, pressure, power, and planetary change. Volcanoes are Earth's natural pressure-release valves, formed when molten rock, called magma, rises from beneath the crust and erupts onto the surface. This can happen at tectonic plate boundaries, like the Pacific Ring of Fire, or over hot spots, like the one beneath Hawaii. When pressure builds up underground, it can lead to explosive eruptions, launching lava, ash, gas, and rock high into the atmosphere. Other eruptions are gentler, with lava flowing slowly across the landscape. The type of eruption depends on the magma's composition, temperature, and gas content. Volcanoes shape Earth's surface, forming islands, mountains, and rich soils. They also affect climate. Massive eruptions can inject sulfur particles into the stratosphere, cooling global temperatures. There are even volcanoes on other planets and moons, including Olympus Mons on Mars, the largest known volcano in the solar system. Volcanoes are destructive, creative, and essential to Earth's dynamic ever-changing surface. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Jellyfish: Ancient Drifters of the SeaAugust 22, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Jellyfish, Ancient Drifters of the Sea. Jellyfish are some of the oldest animals on Earth, with fossils dating back over 500 million years, long before dinosaurs or even trees. Despite their name, Jellyfish aren't actually fish, their invertebrates made mostly of water and soft tissue with no brains, bones, or heart. They move by gently pulsing their bell shaped bodies, but they mostly drift with ocean currents, using tentacles lined with stinging cells to capture prey. These specialized cells, called neomatosis, release tiny barbs loaded with venom in a fraction of a second. Jellyfish come in a wide range of sizes and forms, from coin-sized moon jellies to the lion's main jellyfish, whose tentacles can stretch over 100 feet. Some species even glow in the dark using bioluminescence. Though they seem simple, jellyfish play key roles in ocean ecosystems and are helping scientists study nerve function, regeneration, and even aging. They're ancient, alien, and endlessly fascinating. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Telescopes: Expanding the UniverseAugust 15, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Telehassy, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Telehassy, and today's STEM Minute topic is, telescopes expanding the universe. Telescopes are tools that collect and magnify light, allowing us to see distant objects far beyond the reach of the naked eye. Since Galileo's first telescope in 1609, they've revolutionized our understanding of the cosmos, revealing moons around Jupiter, rings of Saturn, and galaxies billions of light years away. Optical telescopes use lenses or mirrors to gather visible light, while radio, infrared, and x-ray telescopes to take wavelengths we can't see, helping us study phenomena like black holes, quasars, and the early universe. Space-based telescopes like Hubble and James Webb avoid Earth's atmosphere, which can blur or block signals. On the ground, observatories use massive mirrors and adaptive optics to capture incredibly sharp images of deep space. Telescopes are time machines, letting us see light from stars and galaxies emitted millions or even billions of years ago. Each new advance brings us closer to understanding the universe and our place within it. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Telehassy and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
The Kármán Line: Where Space BeginsAugust 8, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is the Carmen Line, where space begins. Where does space begin? Scientists generally mark the boundary at the Carmen Line, located 100 kilometers, 62 miles above Earth's sea level. Named after Hungarian-American physicist, the Yador von Carmen, this line represents the point where Earth's atmosphere becomes so thin that aerodynamic flight no longer works. You'd need to travel at orbital speeds just to generate enough lift. Below the Carmen Line, aircraft rely on air pressure and lift to stay aloft. But above it, there's not enough atmosphere for wings to work, making rocketry, not aviation the only way to maneuver. Though not universally agreed upon, NASA and the US Air Force use 50 miles as their definition, the Carmen Line is widely accepted in aerospace, astronomy, and international law as the official start of outer space. It's an invisible line, but crossing it means entering a realm where Earth's rules begin to give way to the vast physics of space. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
The Periodic Table: Chemistry’s RoadmapAugust 1, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is the Periodic Table, Chemistry's Roadmap. The Periodic Table of Elements is more than just a chart. It's one of the most powerful tools in all of science. Organized by atomic number, it arranges the known chemical elements based on their properties, behaviors, and structure, revealing patterns that help scientists predict how elements will interact. First proposed in 1869 by Demetri Mendeleev, the original table had gaps, spaces left for elements that hadn't been discovered yet. Over time, those blanks were filled, and today the table includes 118 confirmed elements, from lightweight hydrogen to super heavy livermorium. Each column or group contains elements with similar chemical behaviors, while each row or period reflects increasing atomic number and electron configuration. The Periodic Table is a visual key to understanding everything from chemical reactions and bonding to material science and nuclear energy. It's a reminder that even the vast diversity of matter in the universe follows a beautiful underlying order. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Wi-Fi: Invisible Waves that Keep us ConnectedJuly 25, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Wi-Fi, invisible waves that keep us connected. Wi-Fi, short for wireless fidelity, is a networking technology that uses radio frequency signals to transmit data between devices and a central access point, usually a router. It's based on the IEEE 802.11 family of standards. When a device connects to Wi-Fi, it converts data into radio waves and transmits it on the 2.4 or 5 gigahertz bands. Frequency is much higher than FM radio, but far lower than visible light. The router decodes these signals and relays the data through a wired internet connection and vice versa. Wi-Fi's routes trace back to 1992 when John O'Sullivan and a team in Australia developed key technology for wireless data transfer, paving the way for modern Wi-Fi. Today, Wi-Fi powers phones, laptops, smart homes, and more, quietly connecting our digital lives through invisible waves of light speed communication. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Microplastics: Persistent Pollutants at a Microscopic ScaleJuly 18, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is Microplastics, Persistent Pollutins at a Microscopic Scale. Microplastics are synthetic polymer particles smaller than 5 mm. They're classified as primary microplastics manufactured at that size, like microbeads and cosmetics, or secondary microplastics, formed when larger plastics degrade through UV exposure, abrasion, and chemical breakdown. These particles are now found worldwide in oceans, soils, air, and even human tissues. Because of their chemical stability and hydrophobic properties, microplastics can absorb toxins like heavy metals and pesticides, potentially increasing exposure through ingestion. Scientists are investigating environmental impacts, exposure risks, and possible solutions from biodegradable materials to wastewater filtration technologies. Though tiny, microplastics represent a global environmental challenge, a reminder that the durability of plastic comes with a long-term cost. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Neurons: The Brain’s Electric MessengersJuly 11, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee. And today, STEM Minute topic is, NERONS, the Brain's Electric Messengers. NERONS are the basic working units of the brain and nervous system, specialized cells that transmit information using both electrical and chemical signals. Each neuron connects to thousands of others, creating complex communication networks that power everything from reflexes to thoughts. A typical neuron has three main parts, dendrites, which receive signals from other cells, a cell body, which processes that information, and an axon, which sends signals to other neurons or muscles. These messages travel as electrical impulses, and when they reach the end of the axon, they trigger the release of neurotransmitters, chemicals that cross a tiny gap called a synapse to pass the message on. The human brain contains about 86 billion neurons, each capable of firing hundreds of times per second. This incredible connectivity forms the basis of memory, movement, sensation, and even emotion. NERONS are tiny, but together they form the vast intelligent network that makes you, you. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Pi: More than 3.14July 4, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, Pi, more than 3.14. Pi, represented by the 16th letter of the Greek alphabet, is one of the most famous numbers and mathematics. It represents the ratio of a circle circumference to its diameter, and it's the same for every circle, no matter the size. The concept of Pi dates back over 4,000 years, with early approximations from the Babylonians and Egyptians. In ancient India, mathematicians like Aryabata made remarkably accurate calculations of Pi's centuries before it was known in Europe. The symbol Pi was introduced in 1706 by William Jones, and popularized by Leonardo Uler. Pi begins as 3.14159, but it never ends and never repeats, making it an irrational number. Today, we've calculated trillions of digits, though most applications need only a few. From geometry and physics to cosmology and coding, Pi helps describe waves, orbits, and the shape of space itself. Even in a circle, math reminds us that infinity can be just around the corner. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Hurricanes: Nature’s Most Powerful StormsJune 27, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Hurricanes, Nature's most powerful storms. Hurricanes are massive rotating storms fueled by warm ocean water and moist air. Also known as tropical cyclones, they form near the equator when sea surface temperatures rise above 80 degrees. As warm air rises and cools, it releases heat, which fuels the storm and creates a powerful system of spinning winds and rain. At the center of a hurricane is the eye, a calm clear area surrounded by the eye wall, where the strongest winds and heaviest rains occur. Hurricanes are classified by wind speed using the SAFRA Simpson scale from category one to category five. These storms can stretch hundreds of miles across and unleash devastating flooding, storm surge, and wind damage. While satellites help meteorologists track and predict hurricane paths, their intensity can still be difficult to forecast. Understanding Hurricanes science helps us prepare, adapt, and stay safe in the face of one of Nature's most powerful and destructive forces. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Machine Learning: Teaching Machines to ThinkJune 20, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, Machine Learning, Teaching Machines to Think. Machine Learning is a branch of artificial intelligence where computers learn patterns from data, without being explicitly programmed. Instead of following fixed rules, these systems improve over time by analyzing examples and adjusting how they make decisions. For example, if you feed a model thousands of labeled cat photos, it can learn to recognize cats in new, unlabeled images. The more data it processes, the better it becomes. This is how we get voice assistance, recommendation engines, and even self-driving cars. There are different types of machine learning. Supervised learning uses labeled data. Unsupervised learning finds hidden patterns, and reinforcement learning teaches systems through trial and error. Though not perfect, machine learning is one of the most transformative technologies of our time. From healthcare and finance to language translation and space exploration, it's changing the way computers interact with the world, and how we interact with them. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Zero: The Most Powerful NothingJune 13, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, zero, the most powerful nothing. Zero might seem like just a placeholder, but it's one of the most important ideas in mathematics. The concept of zero as a number, not just a symbol for nothing, was first fully developed in ancient India around the 5th century. Later, spreading through the Islamic world into Europe, Mathematically, zero allows us to represent place value, perform calculations, and define the boundaries between positive and negative numbers. Without it, modern math and science would fall apart. Calculus, algebra, computer programming, and even binary code rely on zero. But zero also creates interesting challenges. You can divide by any number except zero, doing so breaks the rules of arithmetic, and in physics, absolute zero is the coldest possible temperature, where atomic motion nearly stops. Zero may represent nothing, but it changed everything. It's the backbone of modern mathematics and a reminder that sometimes, the most powerful ideas begin with nothing at all.
MRIs: Imaging with Magnetic PrecisionJune 6, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is MRIs, imaging with magnetic precision. MRI stands for magnetic resonance imaging, a powerful non-invasive technology that lets doctors see inside the human body in extraordinary detail. It works by combining strong magnetic fields, radio waves, and physics to visualize soft tissues like the brain, muscles, and organs. Your body is mostly water, and water contains hydrogen atoms. Inside an MRI scanner, a strong magnet aligns these atoms. When radio waves are pulsed through the body, the atoms shift, then emit signals as they return to position. These signals are converted into detailed images. MRI research continues to evolve, and one leader in the field is the National Hyde Magnetic Field Laboratory in Tallahassee, Florida, or Maglab. Home to some of the strongest MRI scanners in the world, the Maglab helps push the limits of resolution and speed for both science and medicine. Thanks to MRI and the research behind it, we can explore the body using nothing more than magnets, atoms, and math. Not of WFSU.
Sharks: More Than a StereotypeMay 30, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, sharks, more than a stereotype. With over 550 living species, sharks range in size from the tiny dwarf lantern shark, just eight inches long, to the whale shark, the largest fish in the sea at over 60 feet. Though often seen as fearsome predators, most sharks are small, mid-level feeders, and nearly half live exclusively in the deep sea. One of the most fascinating aspects of shark biology is how they reproduce. Some, like cat sharks, lay eggs. Others give live birth with surprising complexity. In macos and white sharks, embryos consume unfurlized eggs inside the mother. Species like bull sharks and hammerheads even develop a placenta-like connection, much like mammals. At the FSU Coastal and Marine Laboratory, scientists like Dr. Dean Grubb study deep-sea sharks to better understand their ecology and role in ocean ecosystems. Sharks are diverse, essential, and deeply misunderstood. Far more complex than their Hollywood reputation suggests. Not of WFSU.
The Cosmic Microwave Background: Echoes of the Big BangMay 23, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansdine, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is the Cosmic Microwave Background, Echoes of the Big Bang. The Cosmic Microwave Background, or CMB, is a faint glow of radiation that fills the entire universe, a kind of afterglow from the Big Bang. It's the oldest light we can observe, dating back to about 380,000 years after the universe began, when the cosmos cooled enough for atoms to form and light to travel freely. Discovered accidentally in 1965 by Arno Penzias and Robert Wilson, the CMB provided the first solid evidence that the universe had a beginning. It's not visible to the naked eye, but sensitive instruments can detect it as microwave radiation, now stretched by billions of years of cosmic expansion. The CMB isn't perfectly uniform. Tiny temperature variations in this ancient light reveal clues about the early universe's structure, how matter eventually clumped together to form stars, galaxies, and everything we see today. Studying the CMB is like looking at a baby photo of the universe, giving scientists insight into its origin, shape, and ultimate fate.
Lasers: The Science behind the BeamMay 16, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, Lasers, the Science Behind the Beam. Lasers, short for light amplification by stimulated emission of radiation, produce light that's incredibly focused, uniform, and powerful. Unlike ordinary light, which scatters in all directions, laser light travels in a straight narrow beam of a single wavelength. Lasers work by exciting atoms in a material, like a gas, crystal, or semiconductor, until they release photons, particles of light. These photons then stimulate other atoms to release more photons of the exact same wavelength in direction, creating a highly concentrated beam. The precision of lasers makes them useful in countless fields. They're used in medicine for eye surgeries, engineering for cutting and welding, and science for everything from spectroscopy to self-driving cars. In daily life, we see lasers in barcode scanners, blu-ray players, and even laser pointers. Lasers transform technology by giving us a tool that delivers light with accuracy and control. Proving that when science focuses light, it can illuminate entirely new frontiers. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Planetaria: Windows to the UniverseMay 9, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Planetaria, Windows to the Universe. 2025 marks the 100th anniversary of the Planetarium, a century of bringing the wonders of the universe down to Earth. The first modern Planetarium projector debuted in May 1925 in Yena, Germany, revolutionizing how people experience the night sky. Today's modern Planetaria, like the Fog Planetarium at the Challenger Learning Center, are immersive dome theaters powered by advanced digital systems. They simulate the sky from any place in time past, present, or future. Visitors can witness a total eclipse, fly through Saturn's rings, or watch a star be born, all without leaving their seat. Planetaria are more than just stargazing spaces, their powerful tools for STEM education, inspiring curiosity and helping learners visualize complex astronomical concepts. They also serve as cultural hubs combining science, storytelling, and art. As we celebrate a century of discovery, Planetaria continue to evolve, offering new ways to connect with the cosmos, and remind us that even here on Earth, we're part of something much bigger. Not of WFSU.
LCD TVs: Pixels, Light and Liquid CrystalMay 2, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is LCD TVs, pixels, light, and liquid crystals. LCD TVs, short for liquid crystal display, are everywhere from living rooms to laptops, but how do they work? The magic lies in liquid crystals, materials that flow like a liquid but have molecules that can align like a solid. Inside an LCD screen, each pixel is made up of tiny liquid crystal cells, sandwiched between layers of glass and controlled by electrical signals. These crystals don't produce light themselves, they control how much light passes through by twisting or untwisting in response to voltage. Behind the screen is a backlight, usually made up of LEDs, which shines through the liquid crystals. By adjusting how much light each pixel lets through and filtering it through red, green, and blue sub-pixels, the screen creates millions of colors and sharp images. LCD technology transformed how we display images, offering slim energy efficient screens with high resolution. Today's LCD's power everything from TVs and tablets to airplanes and scientific instruments. Listen to archives of STEM Minute at WFSU.org-slash- STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Icebergs: Giants of the Frozen SeaApril 25, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is icebergs, giants of the frozen sea. Icebergs are massive chunks of freshwater ice that break off or cav from glaciers and float in the ocean. Though they drift silently through cold waters, icebergs can weigh millions of tons and rise over 100 feet above sea level. Yet about 90 percent of an iceberg's mass is hidden below the surface. Formed from compacted snow over thousands of years, iceberg ice has incredibly dense. Most icebergs are found in the Arctic and around Antarctica, where glacier edges meet the ocean. Ocean currents and wind carry them great distances. Some even drift into shipping lanes, which is why iceberg tracking began after the Titanic disaster in 1912. Icebergs slowly melt as they travel into warmer waters, releasing fresh water into the ocean. Scientists study them to understand climate change, ocean circulation, and placial dynamics. More than frozen giants, icebergs are natural storytellers, revealing Earth's climate history and the forces that continue to shape our planet. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Semiconductors: The Heart of Modern ElectronicsApril 18, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, semi-conductors, the heart of modern electronics. Semiconductors are materials that have electrical conductivity between that of a conductor, like copper, and an insulator, like rubber. This unique property allows them to control the flow of electricity, making them the foundation of nearly all modern electronic devices. The most common semiconductor material is silicon, which is refined from sand and used to make microchips found in computers, smartphones, solar panels, and countless other technologies. What makes semiconductor special is that their conductivity can be precisely controlled by adding small amounts of other elements, a process called doping. Semiconductors are used to build transistors, tiny switches that turn signals on or off, forming the logic behind digital computing. Billions of these transistors are packed into microprocessors, giving devices their brain power. From powering your phones to enabling artificial intelligence, semi-conductors are everywhere, as technology advances, new materials and designs are being explored to make electronics faster, smaller, and more energy efficient. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Space Weather: Solar Flares and Their Impact on EarthApril 11, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansdine, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, Space Weather, Solar Flares, and their Impact on Earth. Space Weather, driven by the Sun, can have real effects on Earth. Solar Flares are powerful bursts of radiation that come from the Sun's surface. When these flares erupt, they can send streams of charged particles towards Earth, creating a solar wind. When this wind hits Earth's magnetic field, it can cause geomagnetic storms. One beautiful effect of this is the auroras, also known as the Northern and Southern Lights. However, solar flares can also cause disruptions. They can interfere with satellite communications, GPS signals, and even power grids. The most powerful solar storms can cause widespread electrical blackouts, like the one that happened in Quebec in 1989. Scientists monitor solar activity closely using space telescopes and other tools to predict solar flares and mitigate their impact. Understanding space weather is crucial as we become more dependent on satellite technology. While solar flares are a natural part of the Sun's cycle, their effects on our technology here on Earth are anything but routine. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Glass: The Transparent WonderApril 4, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Glass, the Transparent Wonder. Glass has been around for millions of years, naturally occurring glass forms when lightning strikes sand, or when volcanic lava cools rapidly, creating obsidian. The first human-made glass dates back over 4,000 years to ancient Mesopotamian Egypt, where artisans crafted beads and vessels by heating sand and minerals. Modern glass is made by melting sand, soda, ash, and limestone at extreme temperatures, over 1700 degrees Celsius, until they fuse into a liquid. When cooled quickly, the mixture forms an amorphous solid, meaning its atoms lack a rigid structure, giving glass its transparency. By adding different elements, scientists create specialized glass. Boron makes heat-resistant pyrex, while lead creates sparkling crystal. Glass is also essential for fiber optics, smartphone screens, and space telescopes like the James Webb. From ancient obsidian tools to high-tech innovations, glass has shaped human civilization, proving that a simple mix of sand and heat can change the world. Listen to archives of STEM Minute at WFSU.org-slash-stem-minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Cryptography: The Science of Secret CodesMarch 28, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is cryptography, the Science of Secret Codes. Cryptography is the art and science of securing information through codes and ciphers. It has been used for centuries from ancient Egyptian hieroglyphs to secret military messages during wartime. Today, cryptography protects everything from online banking to private messages. At its core, cryptography relies on encryption. The process of scrambling data so only the intended recipient can read it. One of the earliest methods was the cesar cipher, where letters were shifted by a fixed number of places in the alphabet. Modern cryptography, however, is far more complex. Today's encryption methods use mathematical algorithms and prime numbers to create unbreakable codes. Public key cryptography, for example, allows secure communication without sharing a secret key in advance. This system is the foundation of online security, protecting passwords, financial transactions, and even national security data. As technology advances, cryptography continues to evolve. With quantum computing on the horizon, scientists are now developing new encryption methods to keep data secure in the future. Listen to archives of STEM Minute at WFSU.org-slash-stem-minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Diamonds: Nature’s Hardest GemMarch 21, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the Fam U FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, Diamonds, Nature's Hardest Gem. Diamonds are more than just beautiful gemstones, they are the hardest natural material on earth. Made entirely of carbon, diamonds form deep underground under immense heat and pressure, typically over one to three billion years. Their crystal structure makes them incredibly strong, allowing them to cut through metal and glass. Most natural diamonds are formed about 100 miles beneath their surface and are brought up by volcanic eruptions, but diamonds can also be made in laboratories using high pressure techniques that mimic natural conditions. Beyond jewelry, diamonds have important industrial uses, their hardness makes them essential for cutting tools, drilling, and even electronics. Scientists also use diamonds in high-tech applications like lasers and quantum computing. Interestingly, diamonds aren't just found on earth. Some exoplanets have diamond cores, and scientists believe that Neptune and Uranus could have diamond rain in their atmospheres. From deep underground to deep space, diamonds are more than just a symbol of luxury, they're a marvel of science. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Refrigeration: The Science of Keeping CoolMarch 14, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, refrigeration, the science of keeping cool. Refrigeration is the process of removing heat to lower the temperature of an enclosed space, making it essential for preserving food, cooling homes, and even supporting medicine. The idea of artificial cooling dates back to Dr. John Gory, a Florida physician who, in the 1840s, developed one of the first mechanical refrigeration systems to help treat patients suffering from tropical diseases. His work laid the foundation for modern air conditioning and refrigeration technology. Refrigeration works by compressing and expanding gases. A special fluid called refrigerant circulates through coils. First, it's compressed, increasing its temperature. Then, as it moves through condenser coils, it releases heat and turns into a liquid. Next, the refrigerant rapidly expands and evaporates, absorbing heat from inside the fridge or air conditioner. The cycle repeats, continuously removing heat and maintaining a cool environment. From Gory's early experiments to today's advanced cooling systems, refrigeration has transformed how we store food, treat patients, and live comfortably in hot climates. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Helium: The Lightest Noble GasMarch 7, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Helium, the lightest noble gas. Helium is the second most abundant element in the universe, yet it's surprisingly rare on Earth. This colorless, odorless gas is unique. It's the only element that never solidifies under normal pressure, even at absolute zero. Helium is a noble gas, meaning it doesn't easily react with other elements. It's lighter than air, which is why it makes balloons float, but Helium isn't just for party decorations, it plays a crucial role in science and industry. It's used to cool superconducting magnets in MRI machines, as well as in deep-sea diving mixtures to prevent nitrogen narcosis. Unlike other gases, Helium was first discovered in space before being found on Earth. In 1868, astronomers detected an unknown element in the Sun's spectrum, later named Helium after Helios, the Greek god of the Sun. Since Helium is a non-renewable resource extracted from underground gas reserves, scientists are working hard to find ways to conserve it for future use. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Longitude: Mapping the World’s CoordinatesFebruary 28, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansdine, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, Longitude, Mapping the World's Coordinates. Longitude is the system of imaginary vertical lines that run from the North Pole to the South Pole, helping us measure East-West positions on Earth. Unlike latitude, which is based on the equator, longitude has no natural reference point. Instead, it's measured from the Primaridian, an imaginary line running through Greenwich, England. Longitude is measured in degrees, from zero degrees at the Primaridian, to 180 degrees East or West. Each degree of longitude represents a different position on the Earth's surface, but because the planet is a sphere, the distance between longitude shrinks as you move towards the poles. For centuries, determining longitude at sea was a major challenge. Sailors relied on clocks in the position of the Sun. In the 18th century, John Harrison revolutionized navigation by inventing the marine cronometer, a precise clock that allowed sailors to calculate longitude using time differences. Today, GPS systems rely on satellites to pinpoint longitude with incredible accuracy, making global navigation effortless. The pilot is the opinion of the sponsor and not of WFSU.
LEDs: Lighting the FutureFebruary 21, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is LEDs Lighting the Future. Light-emitting diodes or LEDs are energy-efficient lights found everywhere from flashlights to smartphones. Unlike traditional bulbs which generate light by heating a filament, LEDs create light through electric luminescence. Here's how it works. LEDs are made from semiconductor materials. When an electric current passes through the semiconductor, electrons release energy as photons, particles of light. The color depends on the materials properties. For many years, LEDs were limited to red and green light. It wasn't until the 1990s that Asamu Akasaki, Hiroshi Amanu, and Shuji Nakamura developed the blue LED, a breakthrough that earned them the 2014 Nobel Prize in Physics. This innovation paved the way for white LEDs by combining blue light with phosphors. LEDs are highly efficient, converting most energy into light instead of heat. They also last much longer, reducing waste and energy consumption. Today, LEDs power displays, traffic lights, and medical devices, making them a key player in sustainable technology. LED is the opinion of the sponsor and not of WFSU.
Gamma Rays: The Universe’s High-Energy LightFebruary 14, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is Gamma-Rays, the Universe's high energy light. Gamma-Rays are the most energetic form of electromagnetic radiation, produced during the universe's most extreme events, like supernovae, black hole activity, and radioactive decay. Their tiny wavelengths pack immense energy, allowing them to penetrate most materials. On Earth, Gamma-Rays are used in medicine, such as in cancer treatments, where they precisely target and destroy tumors. In space, they help scientists study phenomena like gamma-ray bursts. Brief bright explosions believe to signal the birth of black holes. Earth's atmosphere absorbs gamma-rays, protecting life below, but this means astronomers must use satellites like NASA's Fermi Gamma-Rays Space Telescope to detect them. These observations reveal the universe's most violent processes, offering insights into the extremes of physics. Gamma-Rays showcased the universe's incredible energy, connecting us to its most powerful forces.
Rust: When Metal Meets AirFebruary 7, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is, Rust, when metal meets air. Rust is a common chemical reaction that happens when iron reacts with oxygen and water forming iron oxide. This process is an example of oxidation, where electrons are transferred from iron to oxygen, creating a new compound. When iron is exposed to moisture, water molecules break apart into hydrogen and oxygen. The oxygen reacts with iron, stealing electrons and forming iron ions. These ions, combine with water to produce hydrated iron oxide. The reddish brown substance, we know, is rust. Rusting is accelerated by salt, which increases the conductivity of water, making it easier for electrons to move. That's why metals near oceans are treated with road salt corrode faster. While rust is destructive, it's also an important reminder of chemistry and action. Engineers use coating like paint or galvanization with zinc to predict metals from rust. Understanding this reaction helps us preserve infrastructure and materials in everyday life. Rust may seem simple, but it's a fascinating intersection of chemistry, environment, and engineering. Listen to archives of STEM Minute at wfsu.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and wfsu. Content provided is the opinion of the sponsor and not of wfsu.
The Mathematics of Music: The Harmony of NumbersJanuary 31, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is The Mathematics of Music, the Harmony of Numbers. Music and Math are intertwined with patterns and ratios forming the foundation of Harmony and Rhythm. Sound waves, which are vibrations in the air, create the notes we hear. The pitch of a note depends on the frequency of these waves measured in hertz. For example, the note A above middle C vibrates at 440 hertz. Mathematical ratios define the relationships between notes in a scale, for instance, an octave represents a 2-to-1 frequency ratio, meaning the higher note vibrates twice as fast as the lower one. These ratios create the pleasing harmonies we recognize in music. Rhythm is also mathematical. Time signatures divide music into measures and beats represent fractions of time. Musicians use these patterns to create intricate rhythms and syncopation. Even the design of instruments and the physics of sound waves rely on math. From ancient theories to modern digital production, mathematics is the invisible force that shapes the music we enjoy every day. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor, and not of WFSU.
Taste: A Flavorful JourneyJanuary 24, 2025
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STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansen, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is Taste, a flavorful journey. Taste is a complex process involving your tongue, nose, and brain working together. Your tongue is covered in taste buds, each containing receptor cells that detect five basic tastes. Sweet, salty, sour, bitter, and umami. These receptors send signals to your brain, identifying what you're tasting. But taste is only part of the story. Most of what we perceive as flavor comes from our sense of smell. When you eat, a room is traveled from your mouth to your nose, enhancing the taste experience. That's why food seems bland when you have a cold. Texture and temperature also play a role. Crunchiness, creaminess, and warmth influence how we perceive flavors. Even psychological factors like the color of food can affect how it tastes. This intricate process combines chemistry and biology, creating the rich, diverse world of flavors we enjoy every day. From savoring chocolate to sipping coffee, taste is a remarkable intersection of our senses and brain power. Listen to archives of STEM Minute at WFSU.org-slash-stem-minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
GPS: Mapping the World from SpaceJanuary 17, 2025
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute Topic is GPS, Mapping the World from Space. The Global Positioning System, or GPS, is a network of satellites that helps us determine our precise location anywhere on Earth. At least 24 GPS satellites orbit Earth, each broadcasting signals with their position and the exact time the signal was sent. When your GPS device receives signals from at least four satellites, it calculates how long each signal took to reach it. Since radio waves travel at the speed of light, this information allows the device to measure its distance from each satellite. Using a process called trilateral iteration, the GPS device determines your location by finding the point where the distance is from multiple satellites intersect. This process happens in seconds, giving you real-time updates. GPS relies on incredible precision, even including corrections for Einstein's theory of relativity. Satellites in orbit experience time slightly different than devices on Earth, so their clocks are constantly adjusted. From navigating a road trip to tracking packages, GPS has transformed how we move and communicate in the modern world. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Prime Numbers: The Building Blocks of MathematicsJanuary 10, 2025
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is, Prime Numbers, the Building Blocks of Mathematics. Prime Numbers are the foundation of mathematics. A prime number is any whole number greater than one that has no divisors other than one and itself. For example, two, three, five, and seven are primes. What makes them special is their role as the building blocks of all other numbers. Since any whole number can be expressed as a product of prime numbers, a concept known as the fundamental theorem of arithmetic. Prime numbers are seemingly simple but incredibly mysterious. They appear irregularly on the number line and mathematicians have been studying their properties for thousands of years. Yet some questions about primes, like how they are distributed or whether there are infinite twin primes, pairs of primes like 11 and 13 remain unsolved. Beyond theory, primes have practical applications. They are crucial in modern cryptography where large primes are used to secure digital communication and protect sensitive data. From ancient number theory to cutting edge cybersecurity, prime numbers are a perfect example of how abstract math can shape the world. Listen to archives of STEM Minute at wfsu.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor. and not of wfsu.
3D Printing: Building the FutureJanuary 3, 2025
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is 3D Printing, Building the Future. 3D Printing, also known as additive manufacturing, is a revolutionary technology that creates three-dimensional objects by building them layer by layer. Unlike traditional manufacturing, which often involves cutting or molding materials, 3D printing starts with a digital design and constructs the object from the ground up. The process begins with a computer-aided design file, which is sliced into thin horizontal layers. The printer then deposits material, such as plastic, metal, or even biological tissue, one layer at a time, solidifying each before adding the next. This allows for incredible precision and customization. 3D printing is used in a wide range of fields. Engineers use it to prototype products quickly. Surgeons use it to create custom implants and even astronauts rely on it to print tools in space. It's also paving the way for sustainable practices by reducing waste and enabling localized production. From designing intricate jewelry to building homes, 3D printing is reshaping industries and inspiring new possibilities. It's not just a tool, it's a gateway to innovation. Content provided is the opinion of the sponsor and not of WFSU.
Fractals: Infinite Patterns in NatureDecember 27, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today STEM Minute topic is Fractals, Infinite Patterns in Nature. Fractals are intricate patterns that repeat at every scale, a phenomenon known as self-similarity. Mathematically, fractals are shapes that look the same whether you zoom in or zoom out. They can be described by simple equations, yet their complexity is stunning. You can find fractals everywhere in nature, the branching of trees, the veins and leaves, the structure of snowflakes, and even the coastlines of continents exhibit fractal patterns. One famous example is the Romanesco broccoli, where each smaller spiral resembles the whole vegetable. Fractals also appear in technology and science. They're used to model complex systems like weather patterns, stock markets, and even the structure of galaxies. In medicine, fractal geometry helps analyze blood vessels and the intricate folds of the brain. The beauty of fractals lies in their combination of simplicity and complexity, with a few rules nature creates infinitely intricate designs, reminding us of the underlying order in chaos. Fractals reveal that even the most complex systems often have a surprisingly simple foundation. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Sound Waves: The Science of VibrationsDecember 20, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is Sound Waves, the Science of Vibrations. Sound waves are vibrations that travel through a medium like air, water, or solid materials. When an object vibrates like a guitar string or vocal cords, it creates a disturbance in the surrounding particles. These particles collide with their neighbors, transferring energy in a chain reaction, creating what we perceive as sound. Sound waves are longitudinal, meaning the particles move parallel to the waves direction. They consist of compressions, where particles are pushed together, and rare factions where particles spread apart. The speed of sound depends on the medium. It travels faster in solids, slower in liquids, and even slower in gases, because particle density affects the transmission. The pitch of a sound is determined by its frequency. How many waves cycles occur per second? Higher frequencies create higher pitch sounds, while lower frequencies produce deeper tones. The wave's amplitude or height determines its loudness. Sound waves are essential for communication, music, and even scientific exploration, such as using sonar to map the ocean floor. There are a perfect example of how energy moves through and connects the world around us. Content provided is the opinion of the sponsor, and not of WFSU.
Snowflakes: A Study in Molecular PrecisionDecember 13, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is Snowflakes, a study in molecular precision. Snowflakes are remarkable examples of molecular geometry at work. They form when water vapor and clouds freezes around a microscopic nucleus, such as a dust particle. This initial crystal grows as more water molecules attach themselves, arranging in a precise hexagonal structure due to the hydrogen bonds and water. The unique shape of each snowflake is influenced by the temperature and humidity it encounters during its descent. At colder temperatures, snowflakes tend to form simpler shapes, like hexagonal plates, while slightly warmer conditions produce intricate branching arms. Despite their endless variety, all snowflakes maintain six-fold symmetry, dictated by the molecular structure of ice. Their diversity arises because even tiny fluctuations in their environment can change the way molecules arrange themselves. This makes each snowflake a unique record of the atmosphere conditions it's traveled through. Snowflakes aren't just beautiful, they're also a fascinating demonstration of how physical laws shape the natural world down to the molecular level. And not of WFSU.
Fungi: Nature's Hidden PowerhousesDecember 6, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, fungi, nature's hidden powerhouses. Fungi are some of the most fascinating and versatile organisms on Earth. Neither plants nor animals, fungi belong to their own kingdom and include everything from mushrooms and molds to microscopic yeasts. Despite their own assuming appearance, fungi play critical roles in ecosystems, industries, and even medicine. In nature, fungi are incredible decomposers that break down organic material like dead plants and animals, recycling nutrients back into the soil. Fungi also forms symbiotic relationships with plants. Some fungi, for example, connect with plant roots, helping them absorb water and nutrients in exchange for sugars the plants produce through photosynthesis. Humans have harnessed fungi for countless purposes. Yees help us bake bread and brew beer while penicillin revolutionized medicine as the first antibiotic. Fungi are also key players in developing new medicines, biodegradable materials, and even sustainable food sources. From forest to laboratories, fungi are unsung heroes of life on Earth, quietly shaping the world in ways most of us never notice. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Atoms: Building Blocks of the UniverseNovember 29, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today STEM Minute topic is Adams, Building Blocks of the Universe. Adams, the basic building blocks of matter, were forged in the heart of the universe's most dramatic events. It all began around 13.8 billion years ago with the Big Bang. In the first moments, the universe was an incredibly hot, dense soup of energy. As the universe expanded and cooled, these particles, protons, neutrons, and electrons began to combine. About 300,000 years after the Big Bang, temperatures dropped enough for protons and neutrons to form the first atomic nuclei, mostly hydrogen and helium. This process, known as nucleosynthesis, created the simplest atoms. Heavier elements, like carbon, oxygen, and iron, were formed much later inside stars. Through nuclear fusion, stars combined lighter elements into heavier ones. When massive stars reached the end of their lives and exploded, these heavier elements were scattered across the cosmos, becoming the building blocks of planets, life, and everything around us. Adams, tell the story of the universe's evolution. Every atom in your body was once part of a star, a reminder that we are truly made of stardust. Listen to archives of STEM Minute at WFSU.org-slash-STEM-MINUT. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Black Holes: The Universe's Mysterious GiantsNovember 22, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Telehassy, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Telehassy. And today's STEM Minute topic is Black holes, the universe's mysterious giants. Black holes are among the most fascinating and mysterious objects in the universe. They form when a massive star collapses under its own gravity, creating a region of space where gravity is so strong that nothing, not even light, can escape. The boundary around a black hole, known as the Event Horizon, marks the point of no return. At the heart of a black hole lies the singularity, a point where matter is compressed into infinite density, and the laws of physics as we know them break down. Black holes come in various sizes, from stellar black holes, which are a few times the mass of our sun, to supermassive black holes, millions or billions of times the sun's mass. Studying black holes helps us explore the extremes of physics, testing our understanding of gravity, space, and time. They are both terrifying and awe-inspiring windows into the universe's deepest mysteries. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Telehassy and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Tides: The Moon's Pull on EarthNovember 15, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Tides, the Moon's Pull on the Earth. Tides are the regular rise and fall of sea levels, driven mainly by the gravitational pull of the Moon, and to a lesser degree the Sun. As the Moon orbits Earth, its gravity pulls on the oceans, creating areas of high water levels, which we experience as high tide. On the opposite side of the Earth, another high tide occurs due to the centrifugal force created by Earth's rotation. Low tides happen in the regions between these two high tides. This tidal cycle repeats roughly every 12 hours as Earth rotates, moving different locations under these high water zones. However, not all tides are equal. During full and new moons, when the Sun, Moon, and Earth align, we experience stronger spring tides. When the Moon and the Sun are at right angles, neep tides occur, which are gentler. Tides influence coastal ecosystems, navigation, and even shaped coastlines over time. This regular ebb and flow of water connects us to the movements of the Moon, reminding us of the unseen but powerful forces that work on our planet.
Geometry: The Shape of Our WorldNovember 8, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Geometry, the Shape of Our World. Geometry is the branch of mathematics that studies shapes, sizes, and the properties of space. From the ancient pyramids of Egypt to the design of modern skyscrapers, Geometry has been a fundamental tool in human civilization for thousands of years. At its core, geometry is about understanding the relationships between points, lines, surfaces, and solids. It's divided into two main areas, plain geometry, which deals with flat two-dimensional shapes like circles, triangles, and squares, and solid geometry, which explores three-dimensional objects like cubes, spheres, and pyramids. The principles of geometry are all around us, from the design of buildings and roads to the intricate patterns in nature, such as the symmetry of a flower or the spirals in a seashell. Even in modern technology, geometry plays a key role. It's used in computer graphics, robotics, architecture, and engineering to create precise designs and models. Understanding geometry helps us make sense of the physical world, allowing us to measure, build, and innovate with accuracy and creativity. It's the mathematical framework that shapes our surroundings, literally and figuratively. And not of WFSU.
Botany: The Science of PlantsNovember 1, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is Botany, the Science of Plants. Botany is the branch of biology that focuses on the study of plants. From towering trees to tiny mosses, plants are essential to life on Earth. They produce the oxygen we breathe, form the base of the food chain, and provide habitats for countless organisms. Plants use a process called photosynthesis to convert sunlight into energy. Through their leaves, they capture sunlight and using water and carbon dioxide produce glucose, a type of sugar that fuels their growth. Oxygen is released as a byproduct, making plants crucial for maintaining the balance of gases in our atmosphere. Botanists study all aspects of plant life, including their structure, growth, reproduction, and diseases. They also explore how plants interact with their environments and other organisms. This research is vital in agriculture, medicine, and environmental conservation. For example, botanists work to improve crop yields, discover new medicinal plants, and develop sustainable farming practices. Whether in a dense rainforest or desert landscape, the study of plants helps us understand the intricate web of life on our planet, and how to protect it for future generations.
Light and Photons: The Building Blocks of VisionOctober 25, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee. And today's STEM Minute topic is, light and photons, the building blocks of vision. Light is a form of energy that travels in waves, but did you know it also behaves like a stream of particles? These particles are called photons. Photons have no mass, but they carry energy, and they're responsible for all the light we see. The color of light is determined by its wavelength, with shorter wavelengths like blue light having more energy, and longer wavelengths like red light carrying less energy. Photons move at the speed of light, about 186,000 miles per second in a vacuum, and when they hit our eyes, they trigger chemical reactions that allow us to perceive the world around us. The dual nature of light, acting both as wave and as particle, is known as wave particle duality, a fundamental concept in quantum physics. This discovery revolutionized our understanding of the universe and opened the door to technologies like lasers, solar panels, and fiber optics. Without photons, there would be no light, no color, and no life as we know it. Light is more than just what we see, it's the energy that powers much of our world. Content provided is the opinion of the sponsor and not of WFSU.
Quantum Mechanics: The World of the Very SmallOctober 18, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Quantum Mechanics, the world of the very small. Quantum Mechanics describes the strange behavior of particles at the smallest scales, atoms and subatomic particles. Unlike the predictable world of classical physics, the quantum realm is governed by probability. Particles can exist in multiple states at once, a concept called superposition. They can also become entangled, meaning the state of one particle, can instantaneously affect another, even across vast distances. This field of science challenges our understanding of reality. One famous thought experiment, Schrodinger's Cat, illustrates the weirdness of quantum mechanics. A cat in a box could be both alive and dead at the same time, depending on an outside observation. Quantum mechanics has practical applications too. Technologies like lasers, MRI machines, and even quantum computing, which promises to revolutionize how we process information are based on quantum principles. Though strange and counterintuitive, quantum mechanics is one of the most successful scientific theories, providing incredible insight into the nature of our universe. Content provided is the opinion of the sponsor and not of WFSU.
Eclipses: A Celestial AlignmentOctober 11, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hanzstein, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is Eclipse's A Celestial Alignment. And Eclipse occurs when one celestial body moves into the shadow of another, creating a stunning visual phenomena. There are two main types, solar and lunar. A solar eclipse happens when the moon passes between the Earth and the Sun, blocking the Sun's light. If you're in the right place on Earth, the sky turns dark, and the Sun appears as a glowing ring, or is completely hidden, depending on whether it's a partial or total solar eclipse. A lunar eclipse, on the other hand, occurs when the Earth passes between the Sun and the moon, casting a shadow over the moon. During a total lunar eclipse, the moon often turns a reddish color, earning it the nickname, Blood Moon. This happens because sunlight bends around Earth's atmosphere, scattering red light onto the moon's surface. Eclipse has fascinated humans for centuries, often inspiring myths and stories. Today, they are studied to learn more about the motions of celestial bodies and offer unique opportunity for astronomers and skywatchers alike to witness the mechanics of our solar system in action. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.
Space Weather: Solar Flares and Their Impact on EarthOctober 4, 2024
Transcript
STEM Minute is made possible in part by the Challenger Learning Center of Tallahassee, the K-12 STEM Outreach Program of the FAMU-FSU College of Engineering. Hello, this is Alan Hansdine, the Director of the Challenger Learning Center of Tallahassee, and today's STEM Minute topic is, Space Weather, Solar Flares, and their Impact on Earth. Space Weather, driven by the Sun, can have real effects on Earth. Solar Flares are powerful bursts of radiation that come from the Sun's surface. When these flares erupt, they can send streams of charged particles towards Earth, creating a solar wind. When this wind hits Earth's magnetic field, it can cause geomagnetic storms. One beautiful effect of this is the auroras, also known as the Northern and Southern Lights. However, solar flares can also cause disruptions. They can interfere with satellite communications, GPS signals, and even power grids. The most powerful solar storms can cause widespread electrical blackouts, like the one that happened in Quebec in 1989. Scientists monitor solar activity closely using space telescopes and other tools to predict solar flares and mitigate their impact. Understanding space weather is crucial as we become more dependent on satellite technology. While solar flares are a natural part of the Sun's cycle, their effects on our technology here on Earth are anything but routine. Listen to archives of STEM Minute at WFSU.org slash STEM Minute. STEM Minute is a service of the Challenger Learning Center of Tallahassee and WFSU. Content provided is the opinion of the sponsor and not of WFSU.

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