PARMY OLSON: Why is artificial intelligence not where we hoped it would be?

What do Facebook co-founder Mark Zuckerberg and Tesla CEO Elon Musk have in common? Both are grappling with big problems that stem, at least in part, from putting faith in artificial intelligence systems that have underdelivered. Zuckerberg is dealing with algorithms that are failing to stop the spread of harmful content; Musk with software that has yet to drive a car in the ways he has frequently promised. There is one lesson to be gleaned from their experiences: AI is not yet ready for prime time. Furthermore, it is hard to know when it will be.