Men and women differ in every cell of their bodies because they carry a differing chromosomal pattern. The implications of those genetic components range from obvious to extremely subtle. For example, when researchers visited high school and college campuses to study behavior of the sexes, they observed that males and females even transported their books in different ways. The young men tended to carry them at their sides with their arms looped over the top. Women and girls, by contrast, usually cradled their books at their breasts, in much the same way they would a baby.