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Risto_Saarelma comments on Open Thread, Jul. 27 - Aug 02, 2015 - Less Wrong Discussion
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Sometimes I will be talking to a student, and be perfectly happy to talk with her until a minute before my next class starts, but I'm uncertain of the time. If I make any visible effort to look at the time, however, she will take it as a sign that I want to immediately end our conversation, so I could use your described device.
Obviously the solution is a smartwatch which pushes retractable needles in a pattern that tells the current time in binary into the skin of your wrist once every minute.