Article: Did first Americans come 18,000 years ago?

Scientists studying the genetic signatures of Siberians and American Indians have found evidence that the first human migrations to the New World from Siberia probably occurred no earlier than 18,000 years ago. The new estimate undermines earlier estimates that colonization occurred as far back as 30,000 years ago but reinforces archaeological findings and a linguistic theory that most American languages belong to a single family called Amerind.

The genetic evidence fits neatly, for example, with the discovery of a human campsite in Chile, which is apparently 15,000 years old, and with the well-established presence of big-game hunters in North

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