A study of social networks in the hunter-gatherer Hadza people in Tanzania illuminates the evolutionary origins of humans' unique style of cooperation in groups. See Letter p.497
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Henrich, J. Hunter-gatherer cooperation. Nature 481, 449–450 (2012). https://doi.org/10.1038/481449a
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DOI: https://doi.org/10.1038/481449a
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