The right thing to do: Why do we follow unspoken group rules?

How you dress, talk, eat and even what you allow yourself to feel - these often unspoken rules of a group are social norms, and many are internalized to such a degree that you probably don't even notice them. Following norms, ...

Monkeys express spite toward those who have more

Monkeys, like humans, will take the time and effort to punish others who get more than their fair share, according to a study conducted at Yale. In fact, they can act downright spiteful.

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