The terrorist of the 21st century will not necessarily need bombs, uranium, or biological weapons. He will need only electrical tape and a good pair of walking shoes. Placing a few small pieces of tape inconspicuously on a stop sign at an intersection, he can magically transform the stop sign into a green light in the eyes of a self-driving car. Done at one sleepy intersection, this would cause an accident. Done at the largest intersections in leading metropolitan areas, it would bring the tr...
