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The Value of the Stick: Punishment Was a Driver of Altruism

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Science  23 Jun 2006:
Vol. 312, Issue 5781, pp. 1727
DOI: 10.1126/science.312.5781.1727a

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Altruism has long been an evolutionary mystery. On page 1767 of this issue of Science, anthropologists conclude that such helpful behavior may have arisen as a result of punishment. (Read more.)