The New York Times Opinion columnist Ezra Klein has spent years talking to artificial intelligence researchers. Many of them feel the prospect of A.I. discovery is too sweet to ignore, regardless of the technology’s risks. Today, Mr. Klein discusses the profound changes that an A.I.-powered world will create, how current business models are failing to meet the A.I. moment, and the steps government can take to achieve a positive A.I. future. Also, radical acceptance of your phone addiction may just help your phone addiction.