Facebook has hired an expert in artificial intelligence, Yann LeCun, and says it will open a research lab dedicated to exploring "deep learning" and developing more naturalistic machine-human interfaces. Facebook's interest in AI is intriguing, but mostly for what it says about the company's long-term trajectory, Gary Marcus writes. "The nuances of human expression, verbal and otherwise, are something that A.I. scientists have yet to teach a machine how to decode," Marcus writes.

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