The Magical Dino Egg offers an exciting experiment centered around prehistoric reptiles. When you submerge the white egg completely in a glass or container of water, the hatching process begins. Within about 48 hours, the figure inside expands, causing the shell to slowly crack open and eventually reveal a small dinosaur. This water-activated process clearly teaches patience and observation skills and makes a wonderful small gift for dinosaur fans. The egg requires no batteries whatsoever and works purely through contact with water.