Ex-NASA Engineer Uses Science to Transform Hot Tub Full of Sand into “Liquid Soup”
Ex-NASA engineer Mark Rober specializes in making science fun and exciting via his YouTube channel, which has over 2.5 million subscribers. And recently, after 25 attempts, he was able to transform sand into liquid, making for a unique dip in the hot tub for him and his nephews. From floating rubber duckies to sinking in like quicksand, it's amazing to see how the sand goes from solid to liquid in seconds.












































































