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From PBS:
The kilogram — anywhere in the world, for any purpose — is based on the exact weight of a golf-ball-sized chunk of platinum and iridium stored under three glass bell jars in a vault in an ornate building outside of Paris. Accessing the vault requires three people with three separate keys and the oversight of the Bureau Internationale des Poids et Mesures, the international organization that oversees the International System of Units.
Despite all of this security, in the 129 years since the International Prototype of the Kilogram was forged, polished and sanctioned as an artifact of measurement, it seems to have lost a tiny amount of material.
[...] On Friday, metrologists — people who study the science of measurements — and representatives from 57 nations will gather in a conference room in Versailles, France to redefine the kilogram. In other words: the way we weigh the world is about to change.
Also at Smithsonian, New Atlas, and Nature.
Related: International Prototype of the Kilogram Soon to Become Obsolete
(Score: 0) by Anonymous Coward on Sunday November 18 2018, @04:37AM
And because it's not confusing enough, I give you the following from Wikipedia, emphasis mine:
That's right, the common verbal shorthand for the millimetre is also used, in north america, as a verbal shorthand for a thousandth of an inch.
/headdesk.