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    Scientists vote on new way to measure a kilogram /Link



    For more than 100 years Paris has been home to Le Grand K, a block of metal that defines the precise weight of a kilogram.




    Published on 13 Nov 2018 at 03:22PM

    International prototype of the kilogram International prototype of the kilogram U.S. gets new, hyper-accurate atomic clock U.S. gets new, hyper-accurate atomic clock Quantcast



















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