HistoryMind-BlowingBefore clocks, there were candle clocks that when burned, indicated the passage of periods of time. To set an alarm, you pushed a nail into the desired point and the nail would fall and clank on the metal holder.638k
HistoryWeirdUntil the 1920s, there was a profession called 'knocker-up', which involved going from client to client and tapping on their windows (or banging on their doors) with long sticks until they woke up.437k