On today’s show: we’ll take a look at the new technologies that have allowed researchers to visit the wreckage of the Titanic. Simon Callow talks about his role in the acclaimed new play “Being Shakespeare.” Film preservationist Serge Bromberg discusses some of the rare silent films from around the world that he’s saved. A History of the World in 100 Objects looks at a carved wooden chair from the pre-European Caribbean. Peter Behrens tells us about his new novel, The O’Briens. And R. A. Dickey, of the Mets, describes his life, baseball career, and recent climb up Mt. Kilimanjaro.