Interesting story on how statistical analysis demonstrates that every living human on the planet descended from an individual living as recently as 2000 years ago.
With the help of a statistician, a computer scientist and a supercomputer, Olson has calculated just how interconnected the human family tree is. You would have to go back in time only 2,000 to 5,000 years — and probably on the low side of that range — to find somebody who could count every person alive today as a descendant.
http://www.wired.com/news/wireservice/0,71298-0.html?tw=wn_index_6
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