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Largest Overhaul of Scientific ­nits Since the French Revolution Wins Approval

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Kilogram mass prototypes

Close-up of two kilogram mass prototypes being cleaned.

Credit: Andrew Brookes, NPL-UK/SPL

In the biggest overhaul of the international system of units since 1875, countries have voted to redefine four basic units of measurement—the ampere, the kilogram, the kelvin and the mole.

From Nature
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