Philip K. Dick was living a few miles north of San Francisco when he wrote Do Androids Dream of Electric Sheep?, which envisioned a world where artificially intelligent androids are indistinguishable from humans. The Turing Test has been passed, and it's impossible to know who, or what, to trust. A version of that world will soon be a reality in San Francisco. Google announced this week that Duplex, the company's phone-calling AI, will be rolled out to Pixel phones in the Bay Area and a few other US cities before the end of the year. You might remember Duplex from a shocking demonstration back in May, when Google showed how the software could call a hair salon and book an appointment.