We use the kilo in everything from laboratories to home kitchens. Exactly how much it weighs is defined by the International Prototype Kilo. But it seems to have a weight-loss problem. How will we define what a kilo is in the future?
Scientists have agreed to define a kilogram in terms of an electric current instead of "Le Grand K," a metal cylinder kept in a Paris vault. But the new definition will have no noticeable impact on most people's lives.
It must be a baker's worst nightmare: a world where a kilo ain't a kilo anymore. Next May 20, the universal standard for a kilogram gets its first upgrade in 130 years. There'll be screams a la patisserie.
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