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The Kilogram’s New Diet Plan

  Environmental contamination, and not the holiday season, has caused the International Prototype Kilogram to put on some extra pounds over the decades. Scientists are now looking for a safe and reliable method of cleaning the cylinder so that its mass remains stable and equal to that of several dozen copies around the world....

 

Environmental contamination, and not the holiday season, has caused the International Prototype Kilogram to put on some extra pounds over the decades. Scientists are now looking for a safe and reliable method of cleaning the cylinder so that its mass remains stable and equal to that of several dozen copies around the world.

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