The World's Official Kilogram Is Losing Weight and That Might Screw the …

We've long known that there were some issues with France's 'Le Grand K', the international prototype for what a kilogram really is. Made in 1879 from platinum and iridium alloy, it is the perfect standard for what a kilogram weighs. The problem is, it's losing weight. » 7/08/12 6:00pm 7/08/12 6:00pm