It's a simple question

I need some dates on this one.

Woolly mammoths walked the Earth while the pyramids were being built (well, one small corner of it).

Oxford university was teaching before the Aztec Empire began.

I think I read through an entire AskReddit thread of these. A few I came across on my own and was surprised by: Fibbonacci of the numbers fame could have met Ghengis Khan, Benjamin Franklin could have talked to Isaac Newton, and Galileo was literally the same age as Shakespeare.