1) The concept of virtual reality (VR) involves creating a simulated environment that can be explored and interacted with using specialized headsets and input devices.

2) Bats are the only mammals capable of sustained flight.

3) The world's oldest known recipe is for beer and is over 4,000 years old.

4) In Aztec mythology, the god Quetzalcoatl is associated with the planet Venus, which was seen as a celestial embodiment of his power. His connection to Venus also ties into his association with fertility, renewal, and the cycles of life, as Venus is associated with beauty, love, and abundance.