The Doolittle Institute welcomes Dr. James R. Hansen to discuss his book, "Truth, Lies, and O-Rings: Inside the Space Shuttle Challenger Disaster." Dr. Hansen has written about aerospace history and the history of science and technology for the past thirty years. He has published books and articles on a wide variety of topics ranging from the early days of aviation, the first nuclear fusion reactors, and the Moon landings, to the environmental history of golf courses.