The definition of a kilogram gets changed today.

on November 16th representatives from nearly 60 nations will be meeting in versailles france to vote to change the definition of a kilogram and the fundamental unit of temperature the kelvin, all SI units will be based on fundamental constants of nature and not physical artifacts.
the kilogram is the last base SI unit to be defined by a physical object since 1799 one kilogram has been defined as exactly the mass of a single metal cylinder stored in Paris it was swapped out once in 1889.

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