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Nature: The first Americans: Clues to an ancient migration

An archaeological site in California may have opened up a whole new chapter in the history of humans in the Americas. Researchers claim the site shows evidence of humans interacting with the bones of a mastodon, an ice age relative of elephants and mammoths. New dating suggests the site may be 130,000 years old – 100,000 years earlier than the accepted date for the first human colonisation of the Americas.