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Like it or not, we are defined by being male or female. One of the first things children can tell you about themselves is their sex, and they are remarkably accurate in making the same distinction about their peers. This skill marks the beginning of a lifelong interest in the differences between the sexes, an interest that for many people plays out in casual conversations at parties about the quirky differences in behavior between men and women. However, for some, an interest in the differences between the sexes manifests itself as a commitment to understanding the biological bases for those
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