TIL that before alarm clocks existed, people used nails fixed onto candles to wake up. They knew how to calculate the burning time and put the nail at right position. As the candle melted, the nail fell, made a noise and woke its owner.

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  1. I would need the nail to hit my head for it to have any chance of waking up.

    I’d be late for work half the flippin time cos I slept through my falling nail

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