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One chimp embracing another

Grown-up chimps are less likely to help distressed friends

18 August 2017

Chimpanzees of all ages will comfort upset companions, but adult chimps do it less – perhaps because they are more selective about who they help
A macaque

Monkeys can be tricked into thinking all objects are familiar

17 August 2017

There is a cluster of neurons in monkeys’ brains that decides whether or not they have seen objects before, and stimulating it makes them see everything as familiar

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