Historic vote to redefine the kilogram changes forever the way we measure mass

Historic vote to redefine the kilogram changes forever the way we measure mass  NBCNews.com Kilogram gets a new definition  BBC News Scientists just ditched the single lump of metal that defined the kilogram for 129 years for a better measure  Business Insider The kilogram and three other metric units are about to be revamped  The EconomistFull coverage

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