I can understand a mechanical system falling out of time, but my microwave clock is gradually *gaining* time, and I’m pretty sure it doesn’t have a mainspring.
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ELI5 version: time is kept by counting how much a rock shakes, time is lost by the rock not shaking as fast as it is expected to shake
ELI20: time for digital clocks is kept by a quartz crystal which has a known frequency, of course not everything is perfect, so even a variation of 1hz causes a daily shift of a few seconds
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