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During the early part of the 1900's scientists reasoned that if humans were related to monkies, then the evidence of human evolution would be found were monkies are found: namely Africa. This theory is largely unchallenged.

But the fossil record shows that Africa isn't the only place where primates evolved and lived. It is very possible that human life began in the United States.

Well I think the mitochondrial DNA shows that humans left Africa about 1 million years ago. I think, basically, there are 5 genome types of humans, 4 of which are found only in Africa. All other humans, according to this theory, are descended from a small band of humans who left Africa for the middle east and have spread to the far parts of the earth. The commmon ur-grandmother of all of us (non-Africans) is the so-called Lucy.