Will artificial intelligence provide everyone with a personal assistant? Maybe, but first, AI will have to change how it thinks. To see why, consider a concrete example. Suppose it is Saturday morning and you need help figuring out a tricky weekend schedule. Your daughter’s football team has a game from 3:30 p.m. to 4:30 p.m. but she has been invited to a friend’s birthday party from 3 p.m. to 5 p.m.