More ideas from 利夫
Stabbing a cone into a hemisphere made of horizontally-moving "sand particles" exactly fills a cylinder.

Hemisphere + Cone = Cylinder Stabbing a cone into a hemisphere made of horizontally-moving “sand particles” exactly fills a cyli.

Switch Bot: A Tiny Robot That Flips Any Switch For You Remotely

Sure, you can install smart light switches in your home to be able to turn your lights on and off wherever you are in the world, but what about when you have some other sort of switch or button that n.