Dana Larocca spent decades asking whether biology could be changed, while keeping a fundamental truth about herself hidden. Growing up as a boy, she longed for a girl’s body. In the laboratory, she explored how cells could be reprogrammed. In her own life, she faced the question of when she could finally live openly as the woman she knew herself to be. A molecular biologist and biogerontologist, Dana’s work includes a study in which researchers reprogrammed cells from a woman who lived to 114...