Studies find genetic signature of native Australians in the Americas

The exact process by which humanity introduced itself to the Americas has always been controversial. While there's general agreement on the most important migration—across the Bering land bridge at the end of the last ice age—there's a lot of arguing over the details. Now, two new papers clarify some of the bigger picture but also introduce a new wrinkle: there's DNA from the distant Pacific floating around in the genomes of Native Americans. And the two groups disagree about how it got...

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