Distributia
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Lance LewmanNarrator (voice)
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Peter SingerHimself - Bioethicist, Princeton University (as Prof. Peter Singer)
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Helen FisherHerself - Biological Anthropologist (as Dr. Helen Fisher)
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Sudeepta VarmaHerself - Psychiatrist, NYU Langone Medical Center (as Dr. Sudeepta Varma)
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David LawsHimself
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Lisa LawsHerself
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Don RussellHimself - Pediatrician (as Dr. Don Russell)
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Michael GeraghtyHimself - Straight Spouse Network, Australia