Brian Hare and Vanessa Woods
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![Friends.](https://www.popsci.com/wp-content/uploads/2020/07/09/I2OWVD7QSBHTDFRKMBJCGENVXM.jpg?w=675)
Biology
Humans owe our evolutionary success to friendship Humans owe our evolutionary success to friendship
By Brian Hare and Vanessa Woods
July 21, 2020
By Brian Hare and Vanessa Woods
July 21, 2020