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Science 26 October 2007:
Vol. 318. no. 5850, pp. 581 - 582
DOI: 10.1126/science.1150316
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Perspectives

EVOLUTION:
The Sharp End of Altruism

Holly Arrow

Simulations show that war drives the joint evolution of altruism and hostility to outsiders.

The author is in the Department of Psychology, and the Institute of Cognitive and Decision Sciences, University of Oregon, Eugene, OR 97403-1227, USA. E-mail: harrow{at}uoregon.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)