Setting the time on an oven or microwave is a difficult design problem because nobody does it often enough to learn it, so it needs to be deduced afresh, roughly every six months. I had a novel idea about how to vastly improve the UX: how about *just not displaying the time*?
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If you packed the surroundings with something that decayed at a known rate you measure that and use it to keep the time correct. As an added bonus bit would also cook whatever was in the oven. Possibly near the oven or kitchen in general.
