AI: Where are we and where are we going?

Artificial Intelligence has people fretting. High-profile disagreements among tech gurus make us wonder, anxiously, what the future will be like for ordinary people. If geniuses like Bill Gates, Elon Musk, and the late Stephen Hawking cannot agree on the usefulness and the relative benefits or dangers of AI, what hope is there for us to understand or even imagine how our lives will change?