It turns out that our scales have been lying to us. Since the kilogram was standardised in 1889, the International Prototype near Paris has lost weight, which means scales and balances the world over ...

PARIS — A kilogram just isn't what it used to be. The 118-year-old cylinder that is the international prototype for the metric mass, kept tightly under lock and key outside Paris, is mysteriously ...

SCIENTISTS HAVE SPENT the better part of the past four centuries, since the early days of the Enlightenment, discovering the truth about how the natural world works. A critical part of this endeavor ...

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A kilogram just isn’t what it used to be. Subscribe to read this story ad-free Get unlimited access to ad-free articles and exclusive content. The 118-year-old cylinder that is the international ...