AI is developing faster than experts imagined. Do we need a speed limit?

Artificial intelligence is rapidly developing and is already starting to change the world, at a pace that is worrying to some experts. Huge personalities in the tech industry often lament the dangers of unfettered development of AI systems: people like Elon Musk and Stephen Hawking, who warn of a future where AI reigns supreme. Whether or not their concerns are unfounded, there certainly is a value on keeping tabs on the progress of AI innovation. AI is getting good and in a lot of cases, way better than experts imagined. AlphaGo, Google's game playing AI, has been beating the world's best players for a while now, something that wasn't thought to be possible for at least a decade.