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The sea surface carries many waves at the same time: a sum of lengths, each with its own height and its own direction. That is why a sea state gets written down as a spectrum rather than as a wave. https://www.youtube-nocookie.com/embed/hlkH6Gl9FmI 34 2026-08-14T14:51:01Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/meteor-shower-traces-how-much-you-can-infer/ 2026-08-13 monthly 0.6 https://teenscientists.org/images/videos/Cd7UjSbBh_Y.jpg Meteor shower traces: how much you can infer? A meteor leaves a track, and a track is data: a direction, a moment, a brightness that changes, a rate of slowing down. https://www.youtube-nocookie.com/embed/Cd7UjSbBh_Y 38 2026-08-13T05:54:58Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/which-headphones-are-best-do-you-hear-know-or-believe/ 2026-08-12 monthly 0.6 https://teenscientists.org/images/videos/jFC9x-wvrvA.jpg Which headphones are best? Do you hear, know, or believe? Which headphones are best? Do you hear, know, or believe? https://www.youtube-nocookie.com/embed/jFC9x-wvrvA 53 2026-08-12T18:40:47Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/color-or-how-we-perceive-infinite-combinations-of/ 2026-08-12 monthly 0.6 https://teenscientists.org/images/videos/ho2ysvl_pJM.jpg Color, or How We Perceive Infinite Combinations of Wavelengths When we say a leaf is green, we are describing a *perception*, not the leaf itself. Light from the leaf contains a continuous spectrum of wavelengths. https://www.youtube-nocookie.com/embed/ho2ysvl_pJM 47 2026-08-12T13:19:21Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/physics-is-not-engineering-hooray-it-does-not-work/ 2026-08-11 monthly 0.6 https://teenscientists.org/images/videos/5MyYMhf8WQg.jpg Physics Is Not Engineering: "Hooray, It Does Not Work!" When you aim to build something that works, you are doing engineering. https://www.youtube-nocookie.com/embed/5MyYMhf8WQg 50 2026-08-11T17:33:04Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/physics-of-watermelon-waves-is-it-ripe/ 2026-08-10 monthly 0.6 https://teenscientists.org/images/videos/v0RCtvUlyqE.jpg Physics of Watermelon Waves: Is It Ripe? Tap a watermelon and you hear a hollow thud. Physicists hear a lab experiment in disguise. https://www.youtube-nocookie.com/embed/v0RCtvUlyqE 46 2026-08-10T17:43:29Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/how-big-is-a-rainbow-you-never-saw/ 2026-08-04 monthly 0.6 https://teenscientists.org/images/videos/SryLNXCgTuQ.jpg How Big Is a Rainbow You Never Saw? A rainbow keeps going past the red and past the violet, and what stops it at each end is a different thing entirely. Past the red it is the water: light has to travel into a droplet and back out, and far enough into the infrared the water absorbs all of it on the way. Past the violet the water is fine. It is the sunlight that gives out, because the atmosphere overhead has taken the far ultraviolet before it ever reaches the ground. https://www.youtube-nocookie.com/embed/SryLNXCgTuQ 69 2026-08-04T16:17:37Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/lightning-and-thunder-still-carrying-secrets/ 2026-08-04 monthly 0.6 https://teenscientists.org/images/videos/hzeU77QOEHc.jpg Lightning and Thunder: Still Carrying Secrets Most of the thunder you hear comes from one brief moment in the flash. A lightning channel takes tens of milliseconds to build itself downward, step by step, then unloads in a return stroke whose current rises in microseconds. The long, slow part is nearly silent. That was measured directly in 2023, in three flashes, at a site where lightning is triggered on purpose. https://www.youtube-nocookie.com/embed/hzeU77QOEHc 99 2026-08-04T03:54:35Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/what-shape-is-a-raindrop-physicists-are-still-working-on-it/ 2026-08-03 monthly 0.6 https://teenscientists.org/images/videos/-O97gd4P0VU.jpg What Shape Is a Raindrop? Physicists Are Still Working on It Under about a millimeter, a raindrop is a sphere. Surface tension wins and nothing else gets a say. From one to five millimeters it flattens as it falls, rounded on top and flat or slightly hollowed underneath. Past about five millimeters the base caves in, the drop inflates into a bag and bursts. https://www.youtube-nocookie.com/embed/-O97gd4P0VU 73 2026-08-03T17:20:28Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/a-train-hits-a-tennis-ball-frames-of-reference-explained/ 2026-08-02 monthly 0.6 https://teenscientists.org/images/videos/UJqEJxxN2uE.jpg A Train Hits a Tennis Ball: Frames of Reference Explained A train doing 50 miles an hour meets a tennis ball sitting still. https://www.youtube-nocookie.com/embed/UJqEJxxN2uE 74 2026-08-02T15:53:47Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/schrodingers-cat-on-franklins-kite-the-cat-would-get-wet/ 2026-08-02 monthly 0.6 https://teenscientists.org/images/videos/oOCvD3z-a74.jpg Schrödinger's Cat on Franklin's Kite? The Cat Would Get Wet A proposal arrived in the comments under our Schrödinger's cat video: take the cat, put it on a kite, go discover lightning. https://www.youtube-nocookie.com/embed/oOCvD3z-a74 28 2026-08-02T14:04:56Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/why-a-crookes-radiometer-spins-both-popular-answers-are/ 2026-08-01 monthly 0.6 https://teenscientists.org/images/videos/Ow5-Mg6D5Gs.jpg Why a Crookes Radiometer Spins: Both Popular Answers Are Wrong A radiometer, or light mill: a glass bulb with a little gas left inside and vanes that are black on one side and white on the other. Light falls on it and the vanes spin. https://www.youtube-nocookie.com/embed/Ow5-Mg6D5Gs 89 2026-08-01T19:05:42Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/a-story-of-a-levitating-frog/ 2026-07-30 monthly 0.6 https://teenscientists.org/images/videos/eeikQKVJ3xE.jpg A Story of a Levitating Frog "Flying frogs and floating magnets." That is a real paper title, in the Journal of Applied Physics. https://www.youtube-nocookie.com/embed/eeikQKVJ3xE 80 2026-07-30T16:39:40Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/is-light-a-wave-or-a-particle-two-experiments-two-answers/ 2026-07-30 monthly 0.6 https://teenscientists.org/images/videos/i2sFogV4n-w.jpg Is Light a Wave or a Particle? Two Experiments, Two Answers Is light a wave, or a particle? https://www.youtube-nocookie.com/embed/i2sFogV4n-w 80 2026-07-30T01:23:21Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/what-is-a-black-body-the-sun-is-almost-a-perfect-one/ 2026-07-29 monthly 0.6 https://teenscientists.org/images/videos/agC00kmGvxY.jpg What Is a Black Body? The Sun Is Almost a Perfect One A piece of coal in a cold fire pit looks black. Heat it and it glows red. To a physicist it was a black body the whole time, and the light coming off the hot one is black body radiation. https://www.youtube-nocookie.com/embed/agC00kmGvxY 53 2026-07-29T18:27:33Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/why-do-cats-always-land-on-their-feet-physicists-still/ 2026-07-28 monthly 0.6 https://teenscientists.org/images/videos/NElBvU-JBA0.jpg Why Do Cats Always Land on Their Feet? Physicists Still Argue About It In 2018 Hanno Essén and Arne Nordmark, at the Royal Institute of Technology in Stockholm, published "A simple model for the falling cat problem" in the European Journal of Physics. Physicists have been on this one since the time of Maxwell. https://www.youtube-nocookie.com/embed/NElBvU-JBA0 75 2026-07-28T21:27:40Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/schrodingers-cat-one-electron-two-slits-and-a-cat-in-the-box/ 2026-07-28 monthly 0.6 https://teenscientists.org/images/videos/layR9x-NJX4.jpg Schrödinger's Cat: One Electron, Two Slits, and a Cat in the Box Erwin Schrödinger published the most famous cat in physics in 1935, and he published it as an objection. https://www.youtube-nocookie.com/embed/layR9x-NJX4 77 2026-07-28T21:21:00Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/are-cats-solid-or-liquid-physicists-actually-studied-this/ 2026-07-28 monthly 0.6 https://teenscientists.org/images/videos/DujdQoyIS2Q.jpg Are Cats Solid or Liquid? Physicists Actually Studied This There is a 2014 paper in the Rheology Bulletin titled "On the rheology of cats." Marc-Antoine Fardin wrote it, and it teaches the states of matter better than most textbook chapters on the subject. https://www.youtube-nocookie.com/embed/DujdQoyIS2Q 45 2026-07-28T18:04:16Z yes no https://teenscientists.org/world-of-teen-science/videos/surely-youre-joking/what-is-time-questions-a-physicist-keeps-asking/ 2026-07-27 monthly 0.6 https://teenscientists.org/images/videos/LIQLA0ehBvY.jpg What Is Time? Questions a Physicist Keeps Asking What is time? https://www.youtube-nocookie.com/embed/LIQLA0ehBvY 56 2026-07-27T20:05:35Z yes no https://teenscientists.org/world-of-teen-science/videos/sots-insights/why-middle-and-high-school-scientists-are-joining-the/ 2026-08-05 monthly 0.6 https://teenscientists.org/images/videos/BhZQnaPgehQ.jpg Why Middle and High School Scientists Are Joining the Society of Teen Scientists Middle and high school students from the USA and around the world may apply for membership at the Society of Teen Scientists. https://www.youtube-nocookie.com/embed/BhZQnaPgehQ 43 2026-08-05T00:16:52Z yes no https://teenscientists.org/world-of-teen-science/videos/sots-insights/how-to-get-into-an-ivy-two-paths-worth-knowing-about/ 2026-08-01 monthly 0.6 https://teenscientists.org/images/videos/9W3ltWqepw4.jpg How to Get Into an Ivy: Two Paths Worth Knowing About There are two ways to spend your high school years if you are aiming high, and they ask for opposite work in the same finite hours. https://www.youtube-nocookie.com/embed/9W3ltWqepw4 118 2026-08-01T16:08:53Z yes no https://teenscientists.org/world-of-teen-science/videos/sots-insights/typical-high-school-physics-teaches-riffs-not-music/ 2026-07-27 monthly 0.6 https://teenscientists.org/images/videos/2ZW_bn1gNsU.jpg Typical High School Physics Teaches Riffs, Not Music Physics describes the world you actually live in, and it does it with a depth that is hard to believe until you have seen it. https://www.youtube-nocookie.com/embed/2ZW_bn1gNsU 48 2026-07-27T14:14:44Z yes no https://teenscientists.org/world-of-teen-science/videos/sots-insights/the-rise-and-fall-of-americas-revolution-in-physics/ 2026-07-26 monthly 0.6 https://teenscientists.org/images/videos/w-5DI2P_AyM.jpg The Rise and Fall of America's Revolution in Physics Education In 1956, one of the country's leading physicists decided that the most important work he could do was rewrite a high school course. https://www.youtube-nocookie.com/embed/w-5DI2P_AyM 51 2026-07-26T15:52:40Z yes no https://teenscientists.org/world-of-teen-science/videos/sots-insights/why-physics-comes-last-in-american-high-schools-the-1892/ 2026-07-25 monthly 0.6 https://teenscientists.org/images/videos/Xd8DZcxlQ5U.jpg Why physics comes last in American high schools: the 1892 Committee of Ten Why does physics come last in American high schools, and why is it usually only one year? The answer is a decision made in 1892 by the National Education Association's Committee of Ten, and American schools still follow it. https://www.youtube-nocookie.com/embed/Xd8DZcxlQ5U 60 2026-07-25T16:58:38Z yes no https://teenscientists.org/world-of-teen-science/videos/sots-insights/welcome-to-the-society-of-teen-scientists/ 2026-06-27 monthly 0.6 https://teenscientists.org/images/videos/z2cQZiggm3I.jpg Welcome to the Society of Teen Scientists Why is the sky exactly that color? How does a sound find its way to you through all the leaves? What makes a video game feel alive, and what actually decides the quality of the water near you? These are real research questions, and you answer them the way scientists do: notice one, then chase it until you know something nobody knew before. https://www.youtube-nocookie.com/embed/z2cQZiggm3I 39 2026-06-27T14:25:03Z yes no https://teenscientists.org/world-of-teen-science/videos/sots-insights/sots-physics-lyceum-a-dedicated-track-for-teenagers-with/ 2026-06-27 monthly 0.6 https://teenscientists.org/images/videos/Fub_PhGrCL8.jpg SoTS Physics Lyceum: a dedicated track for teenagers with aptitude for physics The Soviet Union ran a separate track for talented young physicists: its own textbooks, problem sets, and teaching methods, built to find students who could reason and to develop that reasoning fully. The United States never built an equivalent. A talented musician can study at a conservatory. A talented athlete has the school team. Where does a talented physics student go to learn physics for real? https://www.youtube-nocookie.com/embed/Fub_PhGrCL8 44 2026-06-27T14:17:17Z yes no https://teenscientists.org/world-of-teen-science/videos/sots-insights/the-path-from-a-question-to-new-knowledge-sots-princeton/ 2026-06-10 monthly 0.6 https://teenscientists.org/images/videos/zgLvvwO9Mis.jpg The path from a question to new knowledge: SoTS Princeton Research Symposium 2026 At our inaugural Princeton Research Symposium, Society of Teen Scientists students presented research they did themselves: real questions that no one had fully answered yet. https://www.youtube-nocookie.com/embed/zgLvvwO9Mis 42 2026-06-10T17:48:06Z yes no https://teenscientists.org/world-of-teen-science/videos/physics-experiments-at-home/physics-experiments-at-home-free-fall/ 2026-08-13 monthly 0.6 https://teenscientists.org/images/videos/fCwVquhfUAE.jpg Physics Experiments at Home: Free Fall Free fall occurs when gravity is the only force acting on a body. In that case, all objects accelerate downward at the same rate regardless of mass. Near Earth's surface, the acceleration due to free fall is nearly constant, varying only slightly with latitude and altitude. Air resistance, however, opposes this motion: as a body moves through air, it pushes the air aside and the air pushes back. https://www.youtube-nocookie.com/embed/fCwVquhfUAE 70 2026-08-13T14:25:48Z yes no https://teenscientists.org/world-of-teen-science/videos/physics-experiments-at-home/physics-experiments-at-home-precession/ 2026-08-13 monthly 0.6 https://teenscientists.org/images/videos/vLZXcSTa_YQ.jpg Physics Experiments at Home: Precession Precession is the circling of a spinning body's axis. A spinning top does not simply topple over. Instead, its axis leans and then travels around the vertical, tracing a cone, while the top keeps spinning. https://www.youtube-nocookie.com/embed/vLZXcSTa_YQ 48 2026-08-13T19:00:34Z yes no https://teenscientists.org/world-of-teen-science/videos/power-of-physics-imagination/why-do-ice-skates-slide-on-ice-the-secret-of-surface/ 2026-02-12 monthly 0.6 https://teenscientists.org/images/videos/jdf9Jtl-vow.jpg Why Do Ice Skates Slide on Ice? | The Secret of Surface Molecules A common explanation says the blade's pressure melts the ice beneath it. But if that were true, why would skis slide? The real physics of sliding on ice is stranger and more beautiful than you'd expect. https://www.youtube-nocookie.com/embed/jdf9Jtl-vow 106 2026-02-12T19:28:15Z yes no https://teenscientists.org/world-of-teen-science/videos/power-of-physics-imagination/why-does-a-pond-freeze-from-the-top-the-4c-secret/ 2026-02-12 monthly 0.6 https://teenscientists.org/images/videos/Jc3jICaPE6c.jpg Why Does a Pond Freeze from the Top? | The 4°C Secret Hot water rises, cold water sinks. So why does a pond freeze on top instead of the bottom? The answer hides in a strange thing water does below 4°C that keeps fish alive all winter. https://www.youtube-nocookie.com/embed/Jc3jICaPE6c 100 2026-02-12T19:28:09Z yes no https://teenscientists.org/world-of-teen-science/videos/power-of-physics-imagination/can-you-tell-if-youre-moving-coin-toss-on-a-train/ 2026-02-10 monthly 0.6 https://teenscientists.org/images/videos/FUKDeV3qx6I.jpg Can You Tell If You're Moving? | Coin Toss on a Train Can you tell if a train is moving with the windows closed? A simple coin toss reveals the answer. https://www.youtube-nocookie.com/embed/FUKDeV3qx6I 33 2026-02-10T21:01:30Z yes no https://teenscientists.org/world-of-teen-science/videos/power-of-physics-imagination/can-you-survive-a-falling-elevator-by-jumping-physics/ 2026-02-10 monthly 0.6 https://teenscientists.org/images/videos/FHF7BDdxaSU.jpg Can You Survive a Falling Elevator by Jumping? | Physics Thought Experiment You've seen it in movies — an elevator cable snaps. Could you save yourself by jumping right before it hits the ground? https://www.youtube-nocookie.com/embed/FHF7BDdxaSU 34 2026-02-10T20:50:38Z yes no https://teenscientists.org/world-of-teen-science/videos/power-of-physics-imagination/how-low-can-temperature-go/ 2026-02-10 monthly 0.6 https://teenscientists.org/images/videos/SpwakpsR4i4.jpg How Low Can Temperature Go? Take a piece of snow. You can heat it up, boil it, or evaporate it. But what happens when you go the other way — is there a limit? https://www.youtube-nocookie.com/embed/SpwakpsR4i4 53 2026-02-10T20:50:33Z yes no