Why Evolution Is True

by Greg Mayer

The Americas were the last continents to be inhabited, and there has long been controversy about how and when it occurred. There is a general consensus that the earliest Americans arrived from northeastern Asia in the late Quaternary, but the exact peoples involved, the routes taken, when they arrived, and the modes of travel are all much debated. A paper by David Reich and colleagues, in press in Nature, presents evidence on one aspect of the question– did the first inhabitants arrive in one, or in more waves of migration? It has always seemed probable that the Eskimos, culturally and linguistically distinct from the American Indians to the south, and occurring on both sides of Bering Strait, represent a distinct migration, but were the more southern peoples the result of one, two, or more migrations?

Here’s the money quote from Reich et al.’s abstract:

[W]e assembled…

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