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Say Au Revoir to that Hunk of Metal in France that Has Defined the Kilogram 

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Forged in 1879 and sanctioned by the General Conference on Weights and Measures at its first meeting, Le Grand K, the international prototype of the kilogram, has been kept under lock and key in a vault outside Paris.

Credit: BIPM

The world is about to say au revoir to Le Grand K, a cylinder of platinum and iridium that has long reigned over the world's system of weight measurement.

From NPR
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