1) The word "computer" contains three vowels: O, U, and E.

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

3) Aztec mythology, originating from ancient Mesoamerica, includes deities like Quetzalcoatl, Huitzilopochtli, and Tlaloc. It explores concepts of creation, sacrifice, and the cyclical nature of time, with intricate cosmology and rituals forming a significant part of Aztec religious beliefs and practices.

4) The sitcom "Friends" is known for its iconic Central Perk coffee shop, where the main characters often gather.