Guests: Dr. Michio Kaku was the guest for this special Space Show program co-hosted by Dr. Bob Krone. We started the discussion by asking Dr. Kaku about his new best-selling book, "Physics of the Impossible." Dr. Kaku explained to us the three classes of impossibilities involving science, technology, and engineering. You will definitely want to hear this discussion since it relates to many potential space developments. As a result of listener questions and questions from co-host Dr.