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"Beliefs about men and women are as old as humanity itself, but Fines funny, spiky book gives reason to hope that weve heard Testosterone rexs last roar." -- Annie Murphy Paul, New York Times Book Review Many people believe that, at its core, biological sex is a fundamental force in human development. According to this false-yet-familiar story, the divisions between men and women are in nature alone and not part of culture. Drawing on evolutionary science, psychology, neuroscience, endocrinology, and philosophy, Testosterone Rex disproves this ingrained myth and calls for a more equal society based on both sexes full human potential.