https://explainertools.com/videos/how-ai-picks-words/https://explainertools.com/media/shorts/2026-10-13/posters/how-ai-picks-words.webpHow does an AI chatbot pick its next word?A chatbot scores possible next tokens, turns those scores into probabilities, picks one and repeats. Lower temperature sharpens the top choice; higher temperature spreads the chance.https://explainertools.com/media/shorts/2026-10-13/how-ai-picks-words.mp4342026-10-13T00:57:38Zhttps://explainertools.com/videos/walking-is-falling/https://explainertools.com/media/shorts/2026-10-13/posters/walking-is-falling.webpWhy do walking robots fall over so easily?Walking leans the body into a fall, then catches it with the next foot. A harder push moves the capture point farther ahead, so the recovery step must grow.https://explainertools.com/media/shorts/2026-10-13/walking-is-falling.mp4352026-10-13T00:57:38Zhttps://explainertools.com/videos/stopping-distance/https://explainertools.com/media/shorts/2026-10-13/posters/stopping-distance.webpWhy does twice the speed need four times the braking distance?At fixed grip, reaction distance grows with speed while braking distance grows with speed squared. From 50 to 100 km/h, one doubles and the other quadruples.https://explainertools.com/media/shorts/2026-10-13/stopping-distance.mp4372026-10-13T00:57:38Zhttps://explainertools.com/videos/rocket-landing-burn/https://explainertools.com/media/shorts/2026-10-13/posters/rocket-landing-burn.webpWhen should a falling rocket light its engine?A returning Falcon 9 booster cannot hover when its minimum thrust exceeds its landing weight. In the teaching model, one ignition height removes its speed exactly at the pad.https://explainertools.com/media/shorts/2026-10-13/rocket-landing-burn.mp4362026-10-13T00:57:38Zhttps://explainertools.com/videos/satellites-at-dusk/https://explainertools.com/media/shorts/2026-10-13/posters/satellites-at-dusk.webpWhy do you mostly see satellites just after sunset?A satellite makes no light; it reflects sunlight. At about 500 kilometers up, an overhead satellite can stay sunlit until the Sun is roughly 22 degrees below your horizon.https://explainertools.com/media/shorts/2026-10-13/satellites-at-dusk.mp4392026-10-13T00:57:38Zhttps://explainertools.com/videos/count-to-1023/https://explainertools.com/media/shorts/2026-10-13/posters/count-to-1023.webpHow high can you count on ten fingers?Give ten fingers the values 1, 2, 4 and onward, doubling each time. Each up-or-down pattern is one ten-bit number, from 0 through 1,023.https://explainertools.com/media/shorts/2026-10-13/count-to-1023.mp4352026-10-13T00:57:38Zhttps://explainertools.com/videos/bike-gears/https://explainertools.com/media/shorts/2026-10-13/posters/bike-gears.webpWhy is a low gear easier on a hill?A road bike's 34-tooth front ring and 34-tooth rear cog turn the wheel once per pedal turn. Shift to 50/11 and the wheel turns 4.55 times, but the same road force needs 4.5 times the foot force.https://explainertools.com/media/shorts/2026-10-13/bike-gears.mp4332026-10-13T00:57:38Zhttps://explainertools.com/videos/moon-phases/https://explainertools.com/media/shorts/2026-10-13/posters/moon-phases.webpWhy does the Moon change shape?Sunlight always illuminates half the Moon. As the Moon moves around Earth, the fraction of that bright half facing us changes through a 29.5-day cycle.https://explainertools.com/media/shorts/2026-10-13/moon-phases.mp4362026-10-13T00:57:38Zhttps://explainertools.com/videos/why-airplane-mode/https://explainertools.com/media/shorts/2026-10-14/posters/why-airplane-mode.webpWhy does airplane mode matter?A phone turns its power up or down to reach the nearest tower. At cruising altitude it may shout at full power, which can disturb networks on the ground.https://explainertools.com/media/shorts/2026-10-14/why-airplane-mode.mp4392026-10-12T23:45:01Zhttps://explainertools.com/videos/how-gps-works/https://explainertools.com/media/shorts/2026-10-14/posters/how-gps-works.webpHow does GPS know where you are?Your phone never sends anything to the satellites. It times each signal from their atomic clocks, and four distances, one of them fixing the phone's own clock, pin down your position.https://explainertools.com/media/shorts/2026-10-14/how-gps-works.mp4362026-10-12T23:45:01Zhttps://explainertools.com/videos/led-flicker-camera/https://explainertools.com/media/shorts/2026-10-14/posters/led-flicker-camera.webpWhy do LED lights flicker on camera?Many LEDs pulse with the mains power, about 100 or 120 times a second. A phone that reads one row at a time catches some rows on and some off, unless the exposure spans a whole pulse.https://explainertools.com/media/shorts/2026-10-14/led-flicker-camera.mp4332026-10-12T23:45:01Zhttps://explainertools.com/videos/wifi-through-walls/https://explainertools.com/media/shorts/2026-10-14/posters/wifi-through-walls.webpWhy does Wi-Fi slow down through walls?Wi-Fi is radio, and each wall soaks some of it up: drywall about half, concrete a tenth or less. As the signal fades, the link drops to slower, sturdier codes step by step.https://explainertools.com/media/shorts/2026-10-14/wifi-through-walls.mp4352026-10-12T23:45:01Zhttps://explainertools.com/videos/why-ai-agents-need-tools/https://explainertools.com/media/shorts/2026-10-13/posters/why-ai-agents-need-tools.webpWhy do AI agents need tools?A language model only writes text from its training, so it can only guess today's weather. With tools it writes a request, the app runs it, and the model reads the answer.https://explainertools.com/media/shorts/2026-10-13/why-ai-agents-need-tools.mp4342026-10-12T23:45:01Zhttps://explainertools.com/videos/how-cameras-judge-depth/https://explainertools.com/media/shorts/2026-10-13/posters/how-cameras-judge-depth.webpHow can a camera tell how far away something is?Blink one eye, then the other, and your thumb jumps while the far wall stays put. Two cameras set a little apart measure that shift, and simple geometry turns it into a distance.https://explainertools.com/media/shorts/2026-10-13/how-cameras-judge-depth.mp4342026-10-12T23:45:01Zhttps://explainertools.com/videos/portrait-mode-blur/https://explainertools.com/media/shorts/2026-10-13/posters/portrait-mode-blur.webpHow does Portrait Mode fake a blurry background?A phone's tiny lens keeps almost everything sharp, so Portrait Mode estimates how far away each part of the picture is, then blurs it by its distance from the focus point.https://explainertools.com/media/shorts/2026-10-13/portrait-mode-blur.mp4362026-10-12T23:45:01Zhttps://explainertools.com/videos/noise-cancelling/https://explainertools.com/media/shorts/2026-10-13/posters/noise-cancelling.webpHow do noise-cancelling headphones work?Headphones play the opposite of the noise, a wave that squeezes where the noise stretches. Get the timing wrong and the two add up, which is why low, steady hums are the easiest to cancel.https://explainertools.com/media/shorts/2026-10-13/noise-cancelling.mp4372026-10-12T23:45:01Zhttps://explainertools.com/videos/pendulum-clocks/https://explainertools.com/media/shorts/2026-10-13/posters/pendulum-clocks.webpWhy do grandfather clocks have such long pendulums?A pendulum's swing time depends on its length, not its weight. Four times the length gives twice the time, so a one-meter pendulum ticks once a second.https://explainertools.com/media/shorts/2026-10-13/pendulum-clocks.mp4352026-10-12T23:45:01Zhttps://explainertools.com/videos/phone-camera-focus/https://explainertools.com/media/shorts/2026-10-13/posters/phone-camera-focus.webpHow does your phone camera focus?Light from each point meets again at one spot. If that spot lands on the sensor the point is sharp, and a motor moving the lens less than a millimeter makes it so.https://explainertools.com/media/shorts/2026-10-13/phone-camera-focus.mp4352026-10-12T23:45:01Zhttps://explainertools.com/videos/background-blur/https://explainertools.com/media/shorts/2026-10-09/posters/background-blur.webpWhy is the background blurry?Those glowing circles behind a portrait are tiny lights, smeared into discs. See why a lens focuses only one distance, and why closing the aperture shrinks the blur.https://explainertools.com/media/shorts/2026-10-09/background-blur.mp4332026-10-10T00:04:58Zhttps://explainertools.com/videos/starlink-latency/https://explainertools.com/media/shorts/2026-10-09/posters/starlink-latency.webpWhy does Starlink feel so fast?Light is fast, but space is big. See why a satellite 36,000 km up adds half a second to every click, and why dropping to about 500 km means you need thousands of satellites.https://explainertools.com/media/shorts/2026-10-09/starlink-latency.mp4362026-10-10T00:04:58Zhttps://explainertools.com/videos/red-sunsets/https://explainertools.com/media/shorts/2026-10-09/posters/red-sunsets.webpWhy is the sky blue but sunsets red?Air scatters blue light nearly six times more than red. Drag the sun to the horizon and its light crosses nearly forty times more air, so the blue is scattered out before it reaches you.https://explainertools.com/media/shorts/2026-10-09/red-sunsets.mp4312026-10-10T00:04:58Zhttps://explainertools.com/videos/satellites-falling/https://explainertools.com/media/shorts/2026-10-11/posters/satellites-falling.webpWhy don't satellites fall down?Satellites are falling right now. Fire Newton's cannonball faster and faster, and see why at about 8 km/s the curved Earth drops away as fast as the ball falls.https://explainertools.com/media/shorts/2026-10-11/satellites-falling.mp4332026-10-11T19:52:25Zhttps://explainertools.com/videos/red-eye/https://explainertools.com/media/shorts/2026-10-11/posters/red-eye.webpWhy do eyes glow red in flash photos?That red glow is the inside of the eye, lit by the flash and sent straight back. Slide the flash away from the lens, or shrink the pupils first, and the red disappears.https://explainertools.com/media/shorts/2026-10-11/red-eye.mp4352026-10-11T19:52:25Zhttps://explainertools.com/videos/sonic-boom/https://explainertools.com/media/shorts/2026-10-11/posters/sonic-boom.webpWhat makes a sonic boom?A sonic boom isn't a one-time bang. Drag a plane past the speed of sound and watch its rings pile into a cone that booms along the ground the whole time it flies.https://explainertools.com/media/shorts/2026-10-11/sonic-boom.mp4342026-10-11T19:52:25Zhttps://explainertools.com/videos/hurricane-spin/https://explainertools.com/media/shorts/2026-10-11/posters/hurricane-spin.webpWhy do hurricanes spin?Air rushing into a hurricane curves the same way on every side, because Earth is turning. Move the storm across the equator and the spin flips; right at the equator, it stops.https://explainertools.com/media/shorts/2026-10-11/hurricane-spin.mp4372026-10-11T19:52:25Zhttps://explainertools.com/videos/stars-twinkle/https://explainertools.com/media/shorts/2026-10-11/posters/stars-twinkle.webpWhy do stars twinkle but planets don't?Moving pockets of warm and cool air bend starlight like lenses. A star is a single point, so it flickers; a planet is a tiny disk of many points, and their flickers average out.https://explainertools.com/media/shorts/2026-10-11/stars-twinkle.mp4362026-10-11T19:52:25Zhttps://explainertools.com/videos/lightning-distance/https://explainertools.com/media/shorts/2026-10-11/posters/lightning-distance.webpHow far away was that lightning?Light arrives almost instantly; thunder crawls at about 340 m/s. Count the seconds between them: every 3 seconds is about a kilometer, or 5 seconds a mile.https://explainertools.com/media/shorts/2026-10-11/lightning-distance.mp4342026-10-11T19:52:25Zhttps://explainertools.com/videos/monty-hall/https://explainertools.com/media/shorts/2026-10-11/posters/monty-hall.webpShould you switch doors?Your first pick wins one time in three, and the host can't change that. Add doors until it's obvious: with a hundred, switching wins ninety-nine times in a hundred.https://explainertools.com/media/shorts/2026-10-11/monty-hall.mp4342026-10-11T19:52:25Zhttps://explainertools.com/videos/paper-folding/https://explainertools.com/media/shorts/2026-10-11/posters/paper-folding.webpWhy is paper so hard to fold more than seven times?Each fold doubles the thickness, and every bend has to wrap all those layers. That's why twelve folds need a strip nearly a kilometer long, and 42 would reach past the Moon.https://explainertools.com/media/shorts/2026-10-11/paper-folding.mp4372026-10-11T19:52:25Zhttps://explainertools.com/videos/cold-glass-sweats/https://explainertools.com/media/shorts/2026-10-11/posters/cold-glass-sweats.webpWhy does a cold glass sweat?The water on a cold glass comes out of the air. When the air touching the glass chills below its dew point, vapor condenses into droplets; on a dry day, the glass stays dry.https://explainertools.com/media/shorts/2026-10-11/cold-glass-sweats.mp4312026-10-11T19:52:25Zhttps://explainertools.com/videos/torn-qr-code/https://explainertools.com/media/shorts/2026-10-11/posters/torn-qr-code.webpWhy does a torn QR code still scan?Many of a QR code's squares are backup: Reed–Solomon math built from your link. Tear a chunk out and it still scans; damage a corner finder and it fails.https://explainertools.com/media/shorts/2026-10-11/torn-qr-code.mp4332026-10-11T19:52:25Zhttps://explainertools.com/videos/skater-spin/https://explainertools.com/media/shorts/2026-10-11/posters/skater-spin.webpWhy do skaters spin faster with their arms in?No outside twist speeds a skater up. Pulling the arms in lowers the moment of inertia, so to keep the same angular momentum, the body has to turn faster.https://explainertools.com/media/shorts/2026-10-11/skater-spin.mp4342026-10-11T19:52:25Zhttps://explainertools.com/videos/mars-retrograde/https://explainertools.com/media/shorts/2026-10-11/posters/mars-retrograde.webpWhy does Mars seem to move backward?Every two years or so, Mars stops, loops back west and carries on. It isn't reversing: Earth, on the inside track, is overtaking it, as it does around February 19, 2027.https://explainertools.com/media/shorts/2026-10-11/mars-retrograde.mp4352026-10-11T19:52:25Zhttps://explainertools.com/videos/football-spiral/https://explainertools.com/media/shorts/2026-10-11/posters/football-spiral.webpHow do you throw a perfect spiral?A spinning football is a gyroscope. Every throw starts with a little wobble; with enough spin, about ten turns a second, it shrinks into a tight spiral and the nose follows the arc.https://explainertools.com/media/shorts/2026-10-11/football-spiral.mp4342026-10-11T19:52:25Zhttps://explainertools.com/videos/deer-headlights/https://explainertools.com/media/shorts/2026-10-12/posters/deer-headlights.webpWhy do deer freeze in your headlights?A mirror behind a deer's retina, the tapetum lucidum, gives its eyes a second chance at light and sends your headlights straight back. Why deer freeze is still an open question.https://explainertools.com/media/shorts/2026-10-12/deer-headlights.mp4442026-10-12T05:08:58Zhttps://explainertools.com/videos/sunflower-spirals/https://explainertools.com/media/shorts/2026-10-12/posters/sunflower-spirals.webpWhy do sunflower seeds form spirals?Turn every new seed by the same angle. A third of a turn leaves three straight arms with gaps; the golden angle, about 137.5°, packs the head evenly into 34 and 55 spirals.https://explainertools.com/media/shorts/2026-10-12/sunflower-spirals.mp4342026-10-12T05:08:58Zhttps://explainertools.com/videos/heat-pump-more-heat/https://explainertools.com/media/shorts/2026-10-12/posters/heat-pump-more-heat.webpHow can a heat pump give more heat than it uses?A heat pump doesn't make most of its heat. It moves it in from outdoor air, even freezing air. The colder it gets outside, the bigger the lift and the lower the ratio.https://explainertools.com/media/shorts/2026-10-12/heat-pump-more-heat.mp4352026-10-12T05:08:58Zhttps://explainertools.com/videos/hummingbird-wings/https://explainertools.com/media/shorts/2026-10-12/posters/hummingbird-wings.webpHow does a hummingbird hover?Hummingbird wings sweep forward and back about 50 times a second, flipping over at each end so both strokes push air down. In real birds the back stroke gives about a quarter of the lift.https://explainertools.com/media/shorts/2026-10-12/hummingbird-wings.mp4312026-10-12T05:08:58Zhttps://explainertools.com/videos/microwave-cold-spots/https://explainertools.com/media/shorts/2026-10-12/posters/microwave-cold-spots.webpWhy does microwave food heat unevenly?Microwaves overlap into a standing wave: fixed hot bands about 6 cm apart, with weak spots between. Spinning the plate evens it out, but not at the very center.https://explainertools.com/media/shorts/2026-10-12/microwave-cold-spots.mp4322026-10-12T05:08:58Zhttps://explainertools.com/videos/phantom-jams/https://explainertools.com/media/shorts/2026-10-12/posters/phantom-jams.webpWhy do traffic jams appear out of nowhere?One driver taps the brakes. On a quiet road the gaps soak it up; on a busy one each driver brakes harder until someone stops, and the jam drifts backward at about 20 km/h.https://explainertools.com/media/shorts/2026-10-12/phantom-jams.mp4332026-10-12T05:08:58Zhttps://explainertools.com/videos/bent-propellers/https://explainertools.com/media/shorts/2026-10-12/posters/bent-propellers.webpWhy do propellers look bent on camera?Phones read the sensor row by row over about 1/50 s. A fast propeller swings around during that time, so each row catches the blades somewhere new and straight blades come out curved.https://explainertools.com/media/shorts/2026-10-12/bent-propellers.mp4352026-10-12T05:08:58Zhttps://explainertools.com/videos/satellites-falling-explained/https://explainertools.com/media/originals/2026-10-12/posters/satellites-falling-explained.webpWhy don't satellites fall down? Newton's cannon, explainedSatellites are falling right now. Fire Newton's cannonball faster and faster: at about 8 km/s the curved Earth drops away as fast as it falls, and past 11 km/s it escapes for good.https://explainertools.com/media/originals/2026-10-12/landscape/satellites-falling-explained.mp4742026-10-12T05:08:58Zhttps://explainertools.com/videos/red-eye-explained/https://explainertools.com/media/originals/2026-10-12/posters/red-eye-explained.webpWhy do eyes glow red in flash photos? Red-eye, explainedA flash lights up the blood-rich back of a wide-open eye, and the eye sends the red straight back. Slide the flash away from the lens, brighten the room, and see how a pre-flash helps.https://explainertools.com/media/originals/2026-10-12/landscape/red-eye-explained.mp4722026-10-12T05:08:58Zhttps://explainertools.com/videos/sonic-boom-explained/https://explainertools.com/media/originals/2026-10-12/posters/sonic-boom-explained.webpWhat makes a sonic boom? Mach cones, explainedBelow the speed of sound a plane stays inside its own sound rings. Past Mach 1 they pile up into a cone that sweeps the ground the whole time, heard as a sharp double bang.https://explainertools.com/media/originals/2026-10-12/landscape/sonic-boom-explained.mp4752026-10-12T05:08:58Zhttps://explainertools.com/videos/hurricane-spin-explained/https://explainertools.com/media/originals/2026-10-12/posters/hurricane-spin-explained.webpWhy do hurricanes spin? The Coriolis effect, explainedAir rushing into a low turns right north of the equator and left south of it, so storms spin opposite ways. At the equator the effect vanishes, and so do hurricanes. Not your sink, though.https://explainertools.com/media/originals/2026-10-12/landscape/hurricane-spin-explained.mp4732026-10-12T05:08:58Zhttps://explainertools.com/videos/stars-twinkle-explained/https://explainertools.com/media/originals/2026-10-12/posters/stars-twinkle-explained.webpWhy do stars twinkle but planets don't? Atmospheric seeing, explainedA star is a single point, so every wobble of our air shifts all of its light at once. Jupiter is a tiny disk whose flickers average out. Lower the star to the horizon and watch it flash.https://explainertools.com/media/originals/2026-10-12/landscape/stars-twinkle-explained.mp4762026-10-12T05:08:58Zhttps://explainertools.com/videos/lightning-distance-explained/https://explainertools.com/media/originals/2026-10-12/posters/lightning-distance-explained.webpHow far away was that lightning? The flash-to-bang count, explainedLight arrives at once; sound takes about 3 seconds per kilometer, 5 per mile. Count from flash to thunder, see why it rumbles, and why hearing thunder means it's time to head indoors.https://explainertools.com/media/originals/2026-10-12/landscape/lightning-distance-explained.mp4702026-10-12T05:08:58Zhttps://explainertools.com/videos/monty-hall-explained/https://explainertools.com/media/originals/2026-10-12/posters/monty-hall-explained.webpShould you switch doors? The Monty Hall problem, explainedYour first pick has a one-in-three chance, and the host's goat can't change that. Play a thousand games, add a hundred doors, and see why switching wins two times out of three.https://explainertools.com/media/originals/2026-10-12/landscape/monty-hall-explained.mp4692026-10-12T05:08:58Zhttps://explainertools.com/videos/paper-folding-explained/https://explainertools.com/media/originals/2026-10-12/posters/paper-folding-explained.webpWhy can't you fold paper more than seven times? ExplainedEvery fold doubles the thickness, and each fold's curved edge eats paper. See how Britney Gallivan folded a kilometer-long strip 12 times, and how far 42 folds would reach.https://explainertools.com/media/originals/2026-10-12/landscape/paper-folding-explained.mp4702026-10-12T05:08:58Zhttps://explainertools.com/videos/cold-glass-sweats-explained/https://explainertools.com/media/originals/2026-10-12/posters/cold-glass-sweats-explained.webpWhy does a cold glass sweat? The dew point, explainedThe water comes out of the air. When a cold drink chills the air beside the glass below its dew point, vapor condenses. Dry out the room or warm the drink and the sweating stops.https://explainertools.com/media/originals/2026-10-12/landscape/cold-glass-sweats-explained.mp4692026-10-12T05:08:58Zhttps://explainertools.com/videos/torn-qr-code-explained/https://explainertools.com/media/originals/2026-10-12/posters/torn-qr-code-explained.webpWhy does a torn QR code still scan? Error correction, explainedMany of a QR code's squares are Reed–Solomon backup, up to about 30% of the code. Tear a chunk out and it still scans, but cover a corner finder square and most scanners give up.https://explainertools.com/media/originals/2026-10-12/landscape/torn-qr-code-explained.mp4702026-10-12T05:08:58Zhttps://explainertools.com/videos/skater-spin-explained/https://explainertools.com/media/originals/2026-10-12/posters/skater-spin-explained.webpWhy do skaters spin faster with their arms in? Angular momentum, explainedNothing pushes a spinning skater. Pull the arms in and the same angular momentum shows up as speed, from about 1.5 to 4 turns a second, while the skater's muscles add energy.https://explainertools.com/media/originals/2026-10-12/landscape/skater-spin-explained.mp4732026-10-12T05:08:58Zhttps://explainertools.com/videos/mars-retrograde-explained/https://explainertools.com/media/originals/2026-10-12/posters/mars-retrograde-explained.webpWhy does Mars seem to move backward? Retrograde motion, explainedEvery two years or so Mars stops, slides back west and carries on. It isn't reversing: Earth, on the faster inside track, is overtaking it, as it will around February 19, 2027.https://explainertools.com/media/originals/2026-10-12/landscape/mars-retrograde-explained.mp4772026-10-12T05:08:58Zhttps://explainertools.com/videos/football-spiral-explained/https://explainertools.com/media/originals/2026-10-12/posters/football-spiral-explained.webpHow do you throw a perfect spiral? Football physics, explainedSpin turns a football into a gyroscope. At about 600 rpm a shaky release settles into a tight spiral, and the air swings the nose around so the ball comes down nose first.https://explainertools.com/media/originals/2026-10-12/landscape/football-spiral-explained.mp4742026-10-12T05:08:58Z