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Topic: gravity
How far would you have to go to escape gravity?
Every star, black hole, human being, smartphone and atom are all constantly pulling on each other due to one force: gravity. So why don’t we feel pulled in billions of different directions? And is there anywhere in th...
What is fire? Is it a solid, a liquid, or a gas?
Sitting around a campfire, you can feel its heat, smell the woody smoke, and hear it crackle. If you get too close, it burns your eyes and stings your nostrils. You could stare at the bright flames forever as they twi...
How do roller coasters affect your body?
In 1895, crowds flooded Coney Island to see America’s first-ever looping coaster: the Flip Flap Railway. But its thrilling flip caused cases of severe whiplash, neck injury and even ejections. Today, coasters can pull...
The Lunch Feeder, a Rube Goldberg machine for the office
When Joseph Herscher has a lot of work to do at his desk, he still makes sure he eats a healthy lunch: Brussels sprouts, a hot dog with ketchup, asparagus, and some tomato soup. It's a good thing he has the help of an...
Raindrops: What do they really look like?
When you draw raindrops, how do you draw them? Are they tear-shaped with the point at their tops? Is that really what raindrops look like? Dr. Joe Hanson asked that very question. He then tested what happened to water...
Gravity-defying acrobatics set to Clair de lune
"To create – to be creative – is to draw a door on the wall, and then open the door. 'Clair de lune' opens this door wide to transport us to a time where time doesn’t pass. That’s why we become children again when we ...
Creme That Egg, a Pitagora Suichi-inspired chain reaction machine
In 2008, Joseph Herscher of Joseph's Machines launched his YouTube channel with a Pitagora Suichi-inspired chain reaction marble run of sorts that spanned his apartment. The video was called Creme That Egg. And it doe...
Green Ball Adventure, a Sprice Machines chain reaction
Follow this green ball on an adventure across a series of contraptions and chain reactions set up on a pegboard wall. This new screen link video from Steve Price of Sprice Machines features dominoes, pulleys, levers, ...
How do crab spiders use their silk to fly?
Some spiders can catch onto breezes that send them flying across oceans and high up into the skies by ballooning—releasing "numerous strands of silk that they spin up to six feet long." And those threads of silk, ...
A lemon-powered supercar and making the world’s largest lemon battery
Can you power an electric supercar with lemon-power? It depends on the lemon-power. In the video above, science YouTuber and former NASA JPL engineer Mark Rober attempts to fill a 48-kilowatt-hour battery with electri...
Observing the angle of repose with DIY physics devices
The angle of repose or critical angle of repose is how steep various types of materials can be piled without slumping. The steepness of the side of a pile is determined by the amount of friction between the particles ...
Kris Kremo juggles cigar boxes
Juggling legend Kris Kremo began juggling balls, hats, and cigar boxes onstage with his father Béla Kremo in 1970 at age 19, and joined The Blackpool Tower Circus as a solo performer five years later. In this low-...
Math in Motion: Playing with a desktop Galton Board
This delightful little device brings to life the statistical concept of normal distribution. As you rotate the Galton Board on its axis, you set into motion a flow of steel beads that bounce with equal probability to ...
Balanced bottle sculptures by balancing artist Rocky Byun
Balancing artist Rocky Byun has filled his YouTube channel with patience and practice. In his videos, he balances rocks, chunks of ice, bicycles, sticks and other objects, but perhaps his signature medium is the glass...
The Cake Server, a delightfully complex food-themed Rube Goldberg Machine
Rube Goldberg Machines are not only made from a series of imaginative engineering marvels, they're also well-known for being overly complex in comparison to the task achieved. In this intricate machine by Joseph Hersc...
Spinners, a Kaplamino marble run with 10 fidget spinner tricks
Ten fidget spinner tricks keep this marble run moving slowly but steadily forward in one long and delightful take. Spinners is the latest chain reaction video by marble run aficionado Kaplamino. There are more Kapl...
The Blue Marble, an uninterrupted catapult-filled magnet marble run
After 3 months of work and probably more than 500 fails, I'm happy to present you my best video ever. Since magnets and marbles I've always wanted to make a big chain reaction in one take with this 2D style! It's ...
The surprising interactions between copper and neodymium magnets
Experiments with super strong neodymium magnets and copper! These surprising demonstrations of magnetic damping go beyond the magnet through a copper tube demo that we've previously seen. Watch as Night Hawk in Light ...
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