Magic Sand™: Staying Dry Underwater
Hydrophobic sand immersed in water retains a layer of air around itself and comes out dry. In this sphere, sand underwater can be seen to glisten with a silvery sheen due to the layer of air it retains. The sand can be sculpted underwater and when spooned out, comes out dry. Now a common children's toy, it is said to have first been developed to clean up ocean oil spills and then as the bedding material for laying pipes in areas that have severe winters and frozen ground.