Five adaptative challenges stood out most clearly: caring for vulnerable children, forming partnerships with non-kin to reap the benefits of reciprocity, forming coalitions to compete with other coalitions, negotiating status hierarchies, and keeping oneself and one's kin free from parasites and pathogens, which spread quickly when people live in close proximity to each other. (Jonathan Haidt)

Five adaptative challenges stood out most clearly: caring for vulnerable children, forming partnerships with non-kin to reap the benefits of reciprocity, forming coalitions to compete with other coalitions, negotiating status hierarchies, and keeping oneself and one's kin free from parasites and pathogens, which spread quickly when people live in close proximity to each other.

Jonathan Haidt

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