In Phoenix, Ariz., cars are self-navigating the streets. In many homes, people are barking commands at tiny machines, with the machines responding. On our smartphones, apps can now recognize faces in photos and translate from one language to another. Artificial intelligence is here — and it’s bringing new possibilities, while also raising questions. Do these gadgets and services really behave as advertised? How will they evolve in the years ahead? How quickly will they overhaul the way we live and change the way we do business? The Times is exploring these matters this week at our annual New Work Summit, featuring technology executives, A.