Doom co-creator John Carmack also helps create rockets. At QuakeCon 2010 in Dallas, Carmack was displaying his latest, which he hopes to launch this month. It's designed to go up 100,000 feet and then come straight back down. Theoretically.
During a Thursday night "rocket talk" at the con, Carmack talked about the history of his Armadillo Aerospace, a company he has put $4 million into over the last decade and does all sorts of pioneering rocket work.