Scientists are about to redefine how much a kilogram weighs - CNET
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For 129 years, the kilogram has been defined by a lump of metal in a French vault -- but that's about to change.Scientists are about to redefine how much a kilogram weighs - CNET
For 129 years, the kilogram has been defined by a lump of metal in a French vault -- but that's about to change. Read more