http://avmedia.popularmechanics.com/audio/PopMechShow53.mp3 The Future of Private Space: Open-Source X Prize, NASA vs XCOR, Moon Property http://feedproxy.google.com/~r/ThePopularMechanicsShow/~3/Iu3s-xq_a7E/PopMechShow53.mp3 2008-05-12 http://media.popularmechanics.com/images/PodcastIcon.jpg