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Ornate rock cairn left by surfers on the black sand beach of Pololu Valley.I'm obsessed with rock cairns

Scientists have found that Native American populations -- from Canada to the southern tip of Chile -- arose from at least three migrations, with the majority descended entirely from a single group of First American migrants that crossed over through Beringia, a land bridge between Asia and America that existed during the ice ages, more than 15,000 years ago.

Native American populations descend from three key migrations, scientists say

Native American populations descend from three key migrations, scientists say -- ScienceDaily

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