Studying sex differences seldom gets boring. While the origins of differences in behaviour and cognition remain fiercely - and quite rightly - disputed, we don't sweat quite as much about why women and men differ in size and strength. The Darwinian process of sexual selection, in which genes that improve an individual's reproductive success get inherited by the fruits of that reproduction, does a good job explaining sexual dimorphism (male-female differences) in these traits.
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