Measuring Mass: The Last Artefact

Measuring Mass: The Last Artefact
Measuring Mass: The Last Artefact - Just outside Paris, inside a hi-tech vault, and encased in three vacuum-sealed bell jars, rests a small metallic cylinder about the diameter of a golf ball. It may not look like much, but it is one of the most important objects on the planet.


https://hdclump.com/measuring-mass-the-last-artefact/

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