美国亚利桑那州立大学人类进化与社会变化学院的研究人员访问了101位女性，以及她们的812位好友和亲朋。
Researchers from Arizona State University's School of Human Evolution and Social Change in the US, interviewed 101 women alongside 812 of their closest friends and relatives.
合作和社会性学习的优势推动了早期的人类部落走向了另外一条进化的道路。
The advantages of cooperation and social learning then propelled the incipient human groups along a different evolutionary path.
这种行为的进化可能是为了促进社会的包容性，黑猩猩则与之相反，他们有时会拼死攻击陌生人。
This behavior may have evolved to promote social tolerance, in contrast with chimps' sometimes deadly aggression against strangers.
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