My bedroom clock resets itself automatically, but it took me a couple of years to realise this. I couldn't understand why the time changed randomly, as it appeared to me. Eventually, I decided to read the instructions (yes, I know, but it's a clock so I didn't think I needed to). These told me I needed to set the date, since when it's worked perfectly. The randomness was because the default date bore no resemblance to the actual date.
Do I read instructions now? Well, sometimes.
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Editor - Animals & Sci/Tech