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Deep underground in a vault beneath Paris lives the most important lump of metal in the world - Le Grand K. Created in the 19th century, it's the world's master kilogramme, the weight on which every other weight is based. But there is a problem with Le Grand K - it is losing weight. Professor Marcus du Sautoy explores the history of this strange object and the astonishing modern day race to replace it. |
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| Title: | Mass and Moles | |
| Air Date: | June 17, 2013 | |
| Runtime: | 60 min | |
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CollideDuhScope : I concur!