Does nature or nurture shape who we are? Does our personality come from our genes, or the environment we live in? Countless scientific studies on the subject have been published. But one such study – a collaboration between a psychoanalyst and a New York adoption agency – was instead hidden away for decades. Could it be because the study was founded on lies? Because it was unethical? Or might there be some other secrets hiding in the files of Dr. Peter Neubauer?

Today, we welcome a special guest: twin studies expert Dr. Nancy Segal. Check out her book! Deliberately Divided: Inside the Controversial Study of Twins and Triplets Adopted Apart

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