To Group or Not to Group?

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Science  23 Dec 2011:
Vol. 334, Issue 6063, pp. 1648-1649
DOI: 10.1126/science.1209548

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The phenomenon of cooperation between potentially competing individuals raises an interesting question related to evolution: Why should a competitor favor someone else's fitness at the expense of its own (1, 2)? One way to approach this question is through insights on how cooperation and population structure coevolve.