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Thursday, April 19, 2018, 2:44 p.m.

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134-year-old cylinder needs cleaning to stay in top form

A pint may be a pound the world around, but a kilogram is one kilogram only if it is the same weight as a 134-year-old cylinder of platinum-iridium alloy that sits in a vault at the International Bureau of Weights and Measures in Sevres, near Paris.

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