How has artificial intelligence become so powerful, so ubiquitous, so quickly? What used to seem impossible for machines is now yesterday’s news: This current generation of AI brings phenomenal power to problems such as understanding natural language, image recognition, even self-driving vehicles. And while AI seems to promise us the world, it is also limited. So how can we predict a future powered by the new electricity? What is the history of artificial intelligence, how has its capability surged, and how is it used now? Perhaps more importantly, what are its fundamental limitations, and how will they affect what's possible for future generations of this technology?