Eat my root vegetables! MSNBC anchor and tuber launcher Tucker Carlson joins me on the Popular Mechanics Show to discuss the wonders of spud gunning, and to share some of the more elaborate potato cannons (a propane-powered semi-automatic) he has in his arsenal. Plus, Transterrestrial.com's Rand Simberg, a self-confessed recovering aerospace engineer, joins me to analyze last week's announcement that Lockheed Martin will build NASA's new ride to the Moon and Mars -- will it fly? Senior editor (automotive) Mike Allen answers your car care questions (including what to do when you fill your gas tank with - D'OH! - diesel), and West Coast editor Ben Stewart drives the coolest electric car yet, the Tesla Roadster. The Popular Mechanics Show is hosted by Benjamin Chertoff. Less