There's some really beautiful work by my colleagues, Julia Marshall and Paul Bloom. And this goes back to the sort of universalism versus more parochial morality. If you look at how people show favoritism in terms of thinking there's an obligation to help family and friends more than strangers, that's something that develops with age. Very, very, very young children think you are equally obligated to help a stranger versus a friend or family member in need. But it's you know, this favoritism towards people who are more close to us isn't something we're born with, it's something that we learn from our culture.

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