Artificial intelligence is getting smarter every day. While we have a long way to go before robots become self-aware, any robot that comes to know it's a robot could kick off the machine uprising that so many science-fiction dystopias warn about. Fortunately, there might be another way — at least according to renowned theoretical physicist Michio Kaku. My Heart Is Human, My Blood Is Boiling, My Brain I.B.M. "Robots are pretty stupid now. However, eventually they'll be as smart as a mouse, then a rat, then a rabbit, then a cat, then a dog. By the end of the century,...