“Scientists have found that its presence begins to structure the male as different from the female right from the start, from the very beginning of the fetus’s evolution in the uterus (biologically, the original form is the female). Male and female differences in identity are already largely shaped at birth, and behavioral differences between the sexes are recorded very early, before social conditioning can play an effective role. Crudely put, baby girls are more interested in people, whereas baby boys are more interested in things.”