Guest: Dr. Frank Martin. Topic: The NRC "Pathways to Exploration: Rationales and Approaches for a U.S. Program of Human Space Exploration" report. Please direct all comments and questions regarding Space Show programs/guest(s) to the Space Show blog, http://thespaceshow.wordpress.com. Comments and questions should be relevant to the specific Space Show program. Written Transcripts of Space Show programs are a violation of our copyright and are not permitted without prior written consent, even if for your own use.