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Anthropologist Helen Fisher explores the biological workings of our intimate passions, the brew of chemicals, hormones, and neurotransmitters that make the thrilling and sometimes treacherous realms of love and sex. In the research she does for match.com and her TED Talks that have been viewed by millions of people, she wields science as an entertaining, if sobering, lens on what feel like the most meaningful encounters of our lives. In this deeply personal conversation, she shows how it is possible to take on this knowledge as a form of wisdom and power. This interview is edited and produced with music and other features in the On Being episode “This Is Your Brain on Sex.” Find more at onbeing.org.