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When a sick child needs a transplant, the parents are the first to be checked for compatibility. Sometimes the results are impossible. The policy in such cases simply to inform the…

IIRC that might have been a convenience sample of families where non-paternity was suspected. Most estimates of historical non-paternity in Europe yield low single digits.

It's rare that all men form one coalition and all women form another. If you think about it, the winners under monogamy are low status men and high status women, whereas for polygy…