This Engineer Filled a Hot Tub with ‘Liquid’ Sand and the Result Was Magical

Inventor and engineer Mark Rober is a pretty sharp guy. He worked for NASA, for Christ’s sake.

 Fantastic Science

Rober recently shared a video on his YouTube channel that you have to see to believe.

Rober demonstrates how adding air to sand in a very specific way causes the sand to look and act like a fluid. So Rober decided to fill up a hot tub with sand and give it a go. He also enlisted his nephews to help him out.

Check out the video below to see this experiment in action.


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