Uh, Did Google Fake Its Big A.I. Demo?

Google C.E.O. Sundar Pichai's demonstration of the company's new virtual-assistant technology, unveiled at the company's annual developer conference last week, was more unnerving than Pichai presumably intended it to be. Google Duplex, as the technology is called, represents a major leap forward in Silicon Valley's efforts to produce robots that sound like people.

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