Inventor Mark Rober Creates a Liquid Sand Hot Tub

Inventor and former NASA engineer, Mark Rober, demonstrates how he turned a broken hot tub into a giant fluidized bed that makes normal sand behave like a soupy, liquid-like substance.

“Fluidized beds are used in industry for various reasons. They also happen to be really cool to play with and swim in. I made a liquid sand hot tub by adding air in just the right way.”

Previously from Mark: How to Beat Carnival Games That Are Designed to Scam You