Leonardo da Vinci once designed...
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Leonardo da Vinci (1452-1519) once designed a timepiece that could wake a sleeping person by brushing against their foot. This invention is often credited with being the first alarm clock. It wasn't -- not by a long shot. Vitruvius, a Roman architect and engineer who died just over 1,500 years before da Vinci did, described alarm clocks that used gongs and trumpets to get attention, a much more effective method, one would think, than tickling the toes.
Christian monks used water-powered alarm clocks called "water-stealers" to make sure that they didn't miss their daily 3:00 a.m. prayer services.
Christian monks used water-powered alarm clocks called "water-stealers" to make sure that they didn't miss their daily 3:00 a.m. prayer services.

