Take a weight off: 'Grand K' kilo being retired

50-plus nations in a historic vote to approve a ground-breaking overhaul to the international system of measurements. The so-called "Grand K" kilogram, a cylinder of polished platinum-iridium alloy that has been the world's sole true kilo since 1889, is to be retired and will be replaced by a scientific formula to define the exact weight of a kilogram.

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