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A mother and daughter herd their yaks along a highway on the Tibetan plateau. Frederic J. Brown/AFP/Getty Images hide caption

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Frederic J. Brown/AFP/Getty Images

With Help From Extinct Humans, Tibetans Adapted To High Altitude

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Secretary of State Hillary Clinton on Dec. 4 in Brussels, before she fell ill. Kevin Lamarque/AFP/Getty Images hide caption

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Kevin Lamarque/AFP/Getty Images