The way hunter-gatherers share food shows how cooperation evolved

As the Hadza move between camps, group rules trump individual selfishness or generosity

Hadza woman

SWEET SHARE  In a series of experiments, Hadza hunter-gatherers contributed honey-filled straws to a common pot based on shifting group norms, not personal preferences. Here, a Hadza woman has just finished eating honey from her straws.

Eduardo Azevedo

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