The crash test dummy, patron saint of vulnerable motorists, has become a modern icon and is a potent symbol of safety in a risk-obsessed age. But what’s the real story behind this blank-faced semi-human? From a case of mistaken identity in the Roswell UFO incident, to the U.S. military’s top-secret research and development programs of the 1950s, to a series of highly sensitive experiments on humans, animals, and corpses, we chart the bizarre and often gruesome life of this mechanical humanoid.