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The future of the kilo: A weighty matter

from The Guardian

In a vault inside the elegant Louis XIV Pavillon de Breteuil, outside Paris, a small metal cylinder rests on a shelf beneath a double set of bell jars. It has lain there for more than a century, its repose only occasionally disturbed when the vault's three key holders perform a co-ordinated opening ceremony to let technicians enter and clean the ingot. more

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