What can science and empirical study tell us about what happens to us when we die? A conference in Durham this weekend will gather the country’s leading researchers in the field. Host Frank Stasio discusses the science of immortality with Stephan Schwartz, director of The Rhine Center, which hosts the event; and Dr. Jim Tucker, a child psychiatrist and author of “Life Before Life: A Scientific Investigation of Children’s Memories of Previous Lives” (St. Martin’s Press, 2005).