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I think you'd better update your information, since they are finding evidence of human beings (writing and jewellery) up to 600,000 years old now (see today's BBC News online, science section). Evidence for human habitation of N America 20 to 50,000 years ago is preserved at Topper, S Carolina. Naturally there remain some who dispute the evidence, but then some of us have publications to defend. In any case, the picture painted here seems a bit outdated.
Cheers
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