Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

轮岗到养猴子的时候，是我心理压力比较大的一段时间，老饲养员们总是叮嘱我一定要看紧了它们，离开的时候一定要锁好笼舍，不然它们或许会自己打开门溜走。这让我每次进出笼舍都有不小的心理负担，明明锁好了门总惦记着是不是忘了锁。

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

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