Contrast hydrophobic Space Sand with ordinary hydrophilic sand grains. Demonstrate real world examples of conservation of mass, surface tension, polarity, and more as you sculpt, mold and experiment with Space Sand. Watch in fascination as Space Sand repels the water and appears dry immediately after it is removed from water. All lessons are tied in practical applications of this amazing sand. The included bowls are made from corn and are 100% biodegradable!