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Measuring Mass: The Last Artefact

What are the consequences if the object against which we measure all other things changes?

Measuring Mass: The Last Artefact Episodes

Episode 22-04-2023

Measuring Mass: The Last Artefact - Episode 22-04-2023

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. \n\nIt may not look ...

22-04-2023

BBC 4

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