Was the New World Settled Twice?

Were the primary ancestors of today's Native Americans really the first people to set foot in the New World? Genetic evidence suggests so, but ancient skeletons tell a different story. Now, the most detailed analysis yet of ancient American skulls concludes that there were two distinct waves of colonizers from Asia, suggesting that another group got here first.

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Was the New World Settled Twice?

by Andrew Lawle

http://news.sciencemag.org/sciencenow/2010/06/was-the-new-world-settled-twice.html