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Human evolution: Details of being human

A difference in one molecule led physician Ajit Varki to question what sets humans apart from other apes. Bruce Lieberman meets a man who sees a big picture in the finer points.

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Bruce Lieberman is a freelance science writer based in San Diego.

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Lieberman, B. Human evolution: Details of being human. Nature 454, 21–23 (2008).

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