some anthropologists had hypothesized that the lineage’s ancestors populated the Americas in a wave of migration that was distinct from Siberians crossing the Bering land bridge some 20,000 years ...

The land bridge, now submerged under the Bering Strait between Alaska and Russia, was above water from about 36,000 years ago to 11,000 years ago. Scientists thought it might have looked a lot ...

At that level, an area of "dry" land as wide as 1,000km would have stretched from Asia to North America across what is now the Bering Strait. Today, some islands — St. Lawrence Island ...