In this episode Garth and special guest host Jane Halonen interview Nancy Segal from California State University, Fullerton in Fullerton, CA. Nancy discusses her lifelong twin research, books, and current projects. She describes how an undergraduate essay sparked her career, her work with the Minnesota twins reared-apart study, and how behavioral genetics became more accepted as evidence accumulated. She previews her trade book Twinship: What Twins' Ties Reveal About Relationships and notes she has nine published books, including work on Auschwitz twins, switched-at-birth Colombian identical twins, and a case involving gay fathers and twin sons. Nancy discusses twin-loss research, expert-witness cases, and doppelgangers used to counter "treated alike" critiques. She explains rising twinning rates (delayed childbirth, IVF), emphasizes twin studies' relevance to everyone, rejects evidence for "twin telepathy," and invites participation via her website and twin study center.

[Note. Portions of the show notes were generated with Descript AI.]