''The Bering Strait has been the subject of scientific speculation that humans migrated from Asia to the North American continent across a land bridge formed by lower ocean levels in the distant past exposing a ridge beneath the ocean. At periods when the oceans were lower, such as when glaciers locked up vast amounts of water, the exposed ridge would have allowed humans to simply walk from Siberia to Alaska, thus populating North and South America thousands of years ago.''
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