Those who are of, shall we say, a certain age will recognize the quote in the title, from the iconic 1968 sci-fi movie “2001: A Space Odyssey.” The scene involved an interchange between a human—astronaut Dave Bowman—and a machine—HAL 9000, a sentient computer—using voice interaction (Fig. 1). Unfortunately for Dave, HAL's response was “I'm sorry, Dave. I'm afraid I can't do that,” followed shortly by “Dave, this conversation can serve no purpose anymore. Goodbye"...
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