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](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/09/092018_BB_hadza_feat.jpg?fit=860%2C460&ssl=1)
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