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Humans are required to make AI work

South Korean professional Go player Lee Sedol plays against a computer. Photo: Lee Jin-man / AP

Artificial intelligence is so limited, yet such a lucrative buzzword, that companies are selling the work of hundreds of thousands of people as AI, writes the WSJ's Christopher Mims.

Why it matters: Humans have long feared AI as a jobs killer but AI's reliance on human brainpower suggests that new technology could be a boom, not a bust, for jobs.