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May. 23, 2019 3:43 pm
https://www.livescience.com/65522-new-kilogram.html
"The kilogram isn't a thing anymore. Instead, it's an abstract idea about light and energy.
As of today (May 20), physicists have replaced the old kilogram — a 130-year-old, platinum-iridium cylinder weighing 2.2 pounds (1 kilogram) sitting in a room in France —— with an abstract, unchanging measurement based on quadrillions of light particles and Planck's constant (a fundamental feature of our universe)."
