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The reasons for this perceived difference in the behavior of girls and boys are a controversial topic in both public debate and the sciences. The idea that differences in gender roles originate in differences in biology is traditional, but spelled out first explicitly from 19th-century anthropology; more recently, sociobiology and evolutionary psychology have turned to this problem to explain those differences by treating them as evolutionary adaptations to a lifestyle of Paleolithic hunter-gatherer societies. For example, the need to take care of offspring may have limited the females' freedom to hunt and to assume positions of power. Simon Baron-Cohen, a Cambridge University professor of psychology and psychiatry, argues that "the female brain is predominantly hard-wired for empathy, while the male brain is predominantly hard-wired for understanding and building systems."


Source from : http://en.wikipedia.org/wiki