For today's show, we're replaying some of our favorite recent interviews. Investigative journalist Eliza Griswold looks at the geographical and ideological lines where Christianity and Islam collide. Linda Leaming talks about her travels in South Asia. We’ll hear about Blanche, Augustine, and Geneviève, three young women labeled hysterics who shaped our early notions of psychology. Plus, Charles Mann discusses his new book 1493, about the Columbian Exchange, which he calls one of the most momentous biological events since the extinction of the dinosaurs.