Author and journalist Mary Roach talked about her life and career, as well as topics such as living in space and zero gravity, attempts to prove the existence of an afterlife, and the human digestive system, among others. She also answered viewer telephone calls and electronic communications. Ms. Roach has written five non-fiction books, including [Stiff: The Curious Lives of Human Cadavers], [Bonk: The Curious Coupling of Science and Sex], and [Gulp: Adventures on the Alimentary Canal].