In July, LinkedIn co-​​founder Reid Hoffman wore a strange device on his wrist as he gave a talk to the MIT Media Lab. The QSensor, devel­oped by the lab’s Affec­tive Com­puting Group, blinked to dis­play Hoffman’s overall stress level as he spoke. Behind him, the live Twitter feed for #Medi­aL­abTalk scrolled by on two giant screens.

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