Scientists Killed the Kilogram in 2018, Long Live the Kilogram

A kilogram is a kilogram, right? … right? Well, yes and no. For over a century, the kilogram has been defined by a cylinder of platinum and iridium housed in a super secure vault in Paris. Copies of it, dispersed throughout the world, have been periodically measured against this cylinder — called the International Prototype Kilogram — to make sure that international trade, science, and technology communities are all on the same page regarding this basic unit of measurement. If this...

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