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What creates the differences between the sexes? Many would point to culture, and my guest today would agree that culture certainly shapes us. But she\u2019d also argue that at the core of the divergence of the sexes, and in particular, of how men think and behave, is one powerful hormone: testosterone.\n\nHer name is Dr. Carole Hooven, and she\u2019s a Harvard biologist and the author of T: The Story of Testosterone, the Hormone That Dominates and Divides Us.