Egyptian creation stories tell of several variations of how the world was composed. According to one variation, the ocean was the only thing in existence. Then the sun, Ra, came out of an egg (or a flower in some versions) that appeared on the surface of the water. Ra created four children. They were the gods Shu and Geb and the goddesses Tefnut and Nut. Shu and Tefnut became the air, who stood on Geb, the earth, and held up Nut, who became the sky. Ra ruled over all. It was not uncommon for siblings to have children in ancient Egypt, and Geb ....