More questions during Michigan trip!

I came across the following questions when I was on a campus recruiting trip to Michigan. Any inputs on this would be appreciated.

1. Where did the fraternity houses come up?
2. Why do the fraternity houses have some random three Greek letters as their names?
3. How do the fraternity houses pick their names?
4. Why do fossils form?
5. How do fossils form?
6. How do people find the age of a fossil?

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