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Key Facts In This Video
In 1899, the International Bureau of Weights and Measures created an iridium cylinder as the worldwide standard for the kilogram. 00:32
30 years ago, scientists realized that the masses of the original kilogram and its copies are drifting apart. Nobody knows why. 01:03
The BIPM has already redefined other measures using universal constants. A meter, for example, is the distance light travels in 1/299,792,458 of a second. 01:39