My old friend from down the street, Kennewick man, is in the news again. It looks like the Americas were populated by two migrations, one around 14,000 years ago and one around 11,000 years ago. The older migration came from south-east Asia and they had longer, narrower skulls. The more recent migration was from northeast Asia and had short skulls as do modern native Americans.

By the way these modern native Americans have laid claim to the remains of Kennewick Man on the ground that he his one of theirs. Evidence has become more certain that he is much more likely to have been one of the people that were here when the current native Americans arrived.