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The Kilogram Is Losing Weight

19th-century reference object may be off by microscopic amounts

By Jim O'Neill,  Newser User

Posted Nov 9, 2007 9:31 PM CST

(Newser) – To a casual observer, the plum-sized chunk of metal that rests inside a sealed, underground vault near Paris is unremarkable. But to scientists, the cylinder of platinum and iridium is one of the constants upon which science is based. It weighs exactly 1 kilogram, or...   Read full story »

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