Go to the doctor and they won’t begin to treat you without taking your history — and not just yours, but that of your parents and grandparents before you. Pulitzer Prize-winning journalist Isabel Wilkerson points this out as she reflects on her epic work of narrative non-fiction, The Warmth of Other Suns. She’s immersed herself in the stories of the Great Migration, the diaspora of six million African Americans to the north of the U.S. in the 20th century. It’s a carrier of untold histories and truths that help make sense of human and social challenges newly visible at the heart of our life together. This interview is edited and produced with music and other features in the On Being episode “Isabel Wilkerson — The Heart Is the Last Frontier.” Find more at onbeing.org.