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The World's Roundest Object (and Why it Exists)

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The world's roundest object helps solve the longest running problem in measurement -- how to define the kilogram. A kilogram isn't what it used to be. Literally. The name, weight, and definition of a kilogram has been changing constantly since its invention, and the Avogadro Project looks to change that. 

The Avogadro Project sphere is an attempt to link the definition of the kilogram to a concept rather than an object... but the sphere is an object. How does this make sense?

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