Rhodri Marsden: Do we want our laptops to know when we're in a bad

As an emotionally sensitive man who has formulated a grossly over-inflated estimate of his own emotional sensitivity, I want to assure you that if you're feeling bad, I can tell. It's etched into your face, it's detectable in the tone of your voice, and more than evident by the way you keep shouting "bollocks!" at loud volume.

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