The technology underground is a thriving, humming, and often literally scintillating subculture of amateur inventors and scientific envelope-pushers who dream up, design, and build machines that whoosh, rumble, fly, do battle, and hurl pumpkins across enormous distances. William Gurstelle spent two years exploring this world of catapults, pulsejets, rail guns, flamethrowers, Tesla coils, air cannons, and the garage warriors who love them. From the Burning Man festival to the latest gathering of Large Dangerous Rocket Ship builders, meet the men and women who care far more for the laws of physics than they do for mundane matters like government regulations and their own personal safety. Hardbound. No photos, but a decent number of diagrams.