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Circa Clothing buttons invented.
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The Hindu-Arabic numbering system introduced to the west by Italian mathematician, Fibonacci.
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Rodger Bacon invented his gunpowder formula.
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Gun invented in China
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Invention of eyeglasses
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Mechanical clocks invented
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Windmills invented.
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Modern glassmaking begins in Italy
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• Paper bills were first used by the Chinese, who started carrying folding money during the Tang Dynasty (A.D. 618-
• in the form of privately issued bills of credit or exchange notes — and used it for more than 500 years before the practice began to catch on in Europe in the 17th century