This is On Being’s unedited conversation with Marilynne Robinson and Marcelo Gleiser. She’s a Pulitzer Prize-winning novelist and essayist. He’s an astrophysicist and professor at Dartmouth College. Krista Tippett spoke with them on October 15, 2012 at a public event in Philadelphia, “The Mystery We Are.” Download the mp3 of the produced show at onbeing.org.