that mothers of young children cannot collect enough calories to keep themselves and their children alive.33 They rely on the large quantity of food as well as the protection provided by males in their peak years of productivity. Big brains, so useful for gossip and social manipulation (as well as hunting and gathering), could therefore have evolved only if men began chipping in. But in the competitive game of evolution, it’s a losing move for a male to provide resources to a child who is not his own. So active fathers, male-female pair-bonds, male sexual jealousy, and big-headed babies all
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