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This is a very impressive study of the famous hormone and the many ways it is involved in human biology. The scope of scientific and cultural knowledge contained here is truly impressive. Particularly enlightening to me is the material on how sexual differentiation forms in the womb and the way the variations there lead to various intersex conditions and even puberty-triggered transformations that can be unexpected. The book has an exploration of , an Olympic athlete and intersex woman, assigned female at birth, with XY chromosomes and naturally elevated testosterone levels. Similarly revealing is the material on transition including interviews and experiences of people, including one that de-transitioned.