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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. 


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Additional Resources for you to Explore
The Bureau of International Weights and Measurements on Avogadro's Project.
NIST: Redefining the Kilogram
Live Science: Redefining the Kilogram
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About TED-Ed Best of Web

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