"Right now, robots have the intelligence of a bug. They can barely walk across a room. Simple tasks done by humans (picking up garbage, fixing a toilet, building a house, solving a crime) are way beyond what a robot can do. But, as the decades go by, they will become as smart as a mouse, then rat, then a cat, dog, and monkey. By that point, they might become dangerous and even replace humans, near the end of the century. So I think we should a chip in their brain to shut them off if they have murderous thoughts."