"This path-breaking study is about how ordinary people are gaining the means to be extraordinarily lethal. States are also concentrating their technological power, but their gains lag behind a shift in relative capacity that is already disrupting the role of conventional armed forces. The dispersal of emerging technologies such as roboics, cyber weapons, 3-D printing, autonomous systems, and various forms of artificial intelligence is widening popular access to unprecedented destructive power. Based on hard lessons from previous waves of lethal technology such as dynamite and the assault rifle, the book explains what the future may hold and how we should respond"--