August 15th: Encore: Ptolemaic Cosmology – the Universe before Copernicus by kortney.hogan | Aug 15, 2011 | Podcast read more
August 12th: Orbiting Between the Fire and Frying Pan by Bob Hirshon | Aug 12, 2011 | Podcast read more
August 9th: Encore: Robert Zubrin on Why We Must Go to Mars by kortney.hogan | Aug 9, 2011 | Podcast read more