The Daily Telegraph

Measuring Mass: The Last Artefact

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BBC FOUR, 9PM

♦ A beautifull­y made documentar­y about the platinum cylinder known as “Le Grand K” that defined the metric system of weight measuremen­t for the past 130 years – and the internatio­nal scientific project to redefine the kilogram based on mathematic­al constants rather than a single object.

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