Actually the from what i have seen it seems as per anthropological geneticist that the human race was almost wiped out ~50-100k years ago and we are all derived from a group of ~ 200 IIRC Bushmen in S Africa.
http://www.youtube.com/watch?v=-dDXIX-y6aY
Fascinating video.
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Thanks. Very interesting. Tough sell to the Navaho.