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Sex Differences in Children
The most interesting thing that I've learned about sex differences in the last year is differences in throwing accuracy amongst children. So, even in preschoolers, boys are throwing more. They can throw farther with higher velocity, higher speed, and so higher kinetic energy than girls can. It emerges very early, as he said, the preschool years, and becomes extremely large by 19 early adulthood or so. There's very little overlap between men and women, maybe a little bit, but not much. The shoulders are built differently. The forearms are longer in men, relatively relative to overall size in women. That difference is evident prenatally. It is associated with the sex difference in this dorsal stream