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Ancient DNA provides clues of first migration to Americas
The site where Upward Sun River infants were discovered. Photo: Ben Potter / University of Alaska Fairbanks

A team of international scientists announced Wednesday that the remains of a six-week-old girl found in Alaska in 2010 yielded "the second-oldest human genome ever found in North America" — and one corresponding to a previously unknown lineage of humans, according to the New York Times.

Why it matters: The finding gives researchers some of the first archaeological evidence for how people came from Asia to the Western Hemisphere and supports the idea that Siberian migrants settled the Americas, per the Times.