Analysis of the remains of 49 people has revealed that there were at least three major immigration waves from North to South America, instead of just one, as scientists previously believed.

Researchers to date only knew of the first migrants, who arrived in South America at least 11,000 years ago. But DNA analysis published in Cell on November 8 suggests that the second group of settlers replaced the first about 9,000 years ago. And a third group arrived in South America around 4,800 years after that.

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