1) The word "oxygen" contains two vowels: O and E.

2) Egyptian mythology centers around deities such as Ra, Osiris, Isis, Horus, and Anubis. It explores concepts of creation, death, and the afterlife, with elaborate rituals and beliefs shaping ancient Egyptian society. The mythology is richly depicted in temple reliefs, burial sites, and hieroglyphic texts.

3) The world's most expensive car is the Bugatti La Voiture Noire, which sold for over $18 million.

4) The concept of gravity was famously described by Sir Isaac Newton after an apple fell on his head.