The Defense Advanced Research Projects Agency (DARPA) is the radical force behind the nation’s most revolutionary, high-tech military initiatives over the past half century. To write the first definitive history of the world’s most powerful and productive military science agency, bestselling author Annie Jacobsen tracked down DARPA scientists, past and present, including current neuroscientists building an artificial brain, cell biologists working on limb regeneration, and even the Nobel Laureate who invented the laser. From conflict-tested science experiments, like Agent Orange and electronic barriers on the battlefield during Vietnam, to War on Terror insect drones, smart rockets, camera-filled war zones and advanced computer programs, she tracks DARPA from its Cold War inception to present day research controversies. Jacobsen shared her journey to the heart of the military-industrial complex—a place where science fiction and military science collide—and revealed a future that is fascinating and potentially frightening.