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This is something that chimpanzees and... Donald Trump have in common. It causes about 70% of all road deaths and 98% of mass shootings. It also affects height differences, IQ, bed troubles, and the level of media zombification. What is it? The hormone testosterone, which has the audacity to get into a person's life and wreak havoc. Or, on the contrary, order?

Harvard anthropologist Carol Gouwen traces the evolutionary history of testosterone, shedding light on the so-called biology of masculinity and the age-old confrontation between the sexes.