Guests: First Hour: Dr. Klaus Dannenberg, John Karas, Jeff Hamstra; Second Hour: Open Lines: Topics: propulsion, breakthrough propulsion, NASA, AIAA, Open Lines, Space Show guests, bone loss, microgravity, acceleration, NASA. The first hour of this two hour program was dedicated to discussing the coming AIAA Joint Propulsion Conference which will be in Denver, Colorado at the Colorado Convention Center from August 3-5, 2009. For more information about the conference and registration, please visit www.aiaa.org. During Segment 1, our two guests, Dr.