Guest:  Dr. Rachael Seidler;  Topics:  Brain white matter and fluid changes associated with human spaceflight and why it matters.

Guests: Dr. Duane Graveline, Heather Archuletta. Topics: Bed rest microgravity simulation studies. Dr. Graveline is the father of this research. 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.

Guest: Dr. John Jurist. Topics: This is the first in a series of programs focused on the use of bisphosphonates to mitigate bone loss in long duration spaceflight. You are invited to comment, ask questions, & discuss the Space Show program/guest(s) on the Space Show blog, http://thespaceshow.wordpress.com. Comments, questions, & any discussion must be relevant & applicable to Space Show programming.

Guest: Dr. Robert Fitts. Topic: "Prolonged Space Flight and Human Muscles." We welcomed Dr. Robert Fitts to the program to discuss his new research on astronaut muscle atrophy as a result of space flight. The full title of the study for which he was the P.I. is "Prolonged Space Flight-Induced Alternations in the Structure and Function of Human Skeletal Muscle Fibres." The study was published in the Journal of Physiology, Vol. 588, pp. 3567-3592 in the September 2010 edition.

Guest: Dr. Jeffrey Hoffman. Topics: space walks, space tourism, solid rocket boosters, space policy, space vision. Dr. Jeffrey Hoffman was our guest for this Space Show program. In our initial segment, we discussed the Hubble Space Telescope and its repair missions, training for the repair missions, and what its like to do work in space outside the spacecraft. We asked Dr. Hoffman about any sense of speed or height when doing a space walk and if space tourists could do an EVA.