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A Most Unbearable Weight

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Science  07 May 2004:
Vol. 304, Issue 5672, pp. 812-813
DOI: 10.1126/science.304.5672.812

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Summary

LONDON-- The kilogram is the only unit of measure still defined by a physical object. Now, a marathon effort to tie the kilo to a constant of nature is nearing the finish line.

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