http://feedproxy.google.com/~r/ThePopularMechanicsShow/~5/J6BYKWUEqgQ/PopMechShow41.mp3 Airport Headaches, Clean Diesel, M.C. Hammer and More http://feedproxy.google.com/~r/ThePopularMechanicsShow/~3/J6BYKWUEqgQ/PopMechShow41.mp3 2007-11-21 http://media.popularmechanics.com/images/PodcastIcon.jpg