Studying Twins, Lookalikes and 'Other Curious Pairings'

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Identical twins Ella (L) and Eva pose for photographs with two version of Dutch artist Vincent van Gogh's Sunflowers paintings at the National Gallery in London. (LEON NEAL/AFP/Getty Images)

Author and psychology professor Nancy Segal invites readers to call her a "twin tracker," referring to her decades-long career researching twins, multiples, unrelated lookalikes and what she calls "other curious pairings." Her latest book, "Accidental Brothers," details the experiences of two sets of Colombian identical twin brothers who were accidentally exchanged at birth and raised unknowingly as fraternal twins until the age of 25, when the mix-up came to light. She joins Forum to talk about the brothers' story and what it reveals about the influences of nature and nurture.

Dr. Nancy L. Segal, director, Twin Studies Center at CSU, Fullerton; author, "Accidental Brothers: The Story of Twins Exchanged at Birth and the Power of Nature and Nurture"