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Do all human beings have a single oldest ancestor (a man and a woman), or were there were many ancestors at the same time at different places on earth? This article sheds some light. Is there another authoritative report released more recently?

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biology.stackexchange.com/questions/7184/… covers much of the same material. –  kmm Apr 12 '13 at 18:21
    
Isn't that Adam? ;) –  Bitwise Apr 13 '13 at 23:34
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You are talking about the mitochondrial eve and the chromosome Y adam. At some point there must be just one pair, though historically the evidence can be lost if there is a near complete extinction event. Current evidence for eve points to SE Africa.

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