Swinging an open glass of water sounds like a recipe for a mess, but not when you understand the physics behind the trick!

https://www.stevespanglerscience.com/lab/centripetal-force-board/

When you swing a bucket of water over your head, you probably expect a big, wet rush of water to soak you as the bucket goes upside down. However, if you were swinging the bucket fast enough, nothing happens. Well,...