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German engineer Nikolaus Otto constructed an engine that, unlike the steam engine, used the burning of gas contained in the engine to maneuver a piston. This type of engine would later be used to power automobiles. Hourglass and water clocks had been round for lots of of years, however the first mechanical clocks began to appear in Europe towards the tip of the thirteenth century and have been utilized in cathedrals to mark the time when providers would be held. Alchemists in China invented gunpowder because of their seek for life-extending elixirs. The data of gunpowder spread to Europe in …