New World Ancestors Lose 12,000 Years
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 arguments for colonization 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.