- Straight Dope: If one was to go back 30 generations in time in their family tree, you would have over a BILLION ancestors. Eventually, you arrive at a point where you have more ancestors than there have ever been people in the world. http://www.straightdope.com/columns/read/412/2-4-8-16-how-can-you-always-have-more-ancestors-as-you-go-back-in-time 42 comments science
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