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1642 in science
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==Computing== * 19-year-old [[Blaise Pascal]] begins to develop the [[Pascaline]], the first practical [[mechanical calculator]], initially to help with the recording of taxes.<ref>{{cite book|title=Histoire des instruments et machines à calculer: trois siècles de mécanique pensante 1642-1942|first=Jean|last=Marguin|year=1994|location=Paris|publisher=Hermann|isbn=978-2-7056-6166-3|page=48}}</ref>
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