OLD AND BUSTED: “[Alan] Turing had pointed out that, if one could carry out a prolonged conversation with a machine—whether by typewriter or microphones was immaterial—without being able to distinguish between its replies and those that a man might give, then the machine was thinking, by any sensible definition of the word. [The HAL 9000] could pass the Turing test with ease.”

—Arthur C. Clarke, the novelization of 2001: A Space Odyssey. 

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