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Nitpick for Doug S.: that’s actually two coupled evolutionary limits. Babies’ heads need to fit through the women’s pelvises, which also have to be narrow enough for useful locomotion.
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Agreement karma indicates agreement, separate from overall quality.
Nitpick for Doug S.: that’s actually two coupled evolutionary limits. Babies’ heads need to fit through the women’s pelvises, which also have to be narrow enough for useful locomotion.