"For some reason, the official kilo — a 118-year-old lump of metal stored in a vault at the International Bureau of Weights and Measures outside Paris — has slimmed down by as much as 50 micrograms in the past century." (Wired)
The Australian Commonwealth Scientific and Industrial Research Organization plans to make a sphere out of silicon that will not only be exactly one kilogram but will also be the most perfect sphere in existence.
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