The first-ever inside look at DARPA-the Defense Advanced Research Projects Agency-the maverick and controversial group whose futuristic work has had amazing civilian and military applications, from the Internet to GPS to driverless cars America's greatest idea factory isn't Bell Labs, Silicon Valley, or MIT's Media Lab. It's the secretive, Pentagon-led agency known as DARPA. Founded by Eisenhower in response to Sputnik and the Soviet space program,...