At the Google I/O, we watched in awe as Google's artificial intelligence (Google Duplex) called a local hair salon to make an appointment. The crowd laughed as the machine said "Mm-hmm" and "Uhmmm" - subtle fluctuations to imitate a human speaking. People commenting on this demonstration were equally amazed and disturbed that the human on the other end of the line did not know she was talking to a machine. Of course, one question was "is that legal?" Shouldn't Google notify t