For over a hundred years, the official definition of a kilogram was a metal cylinder held under three locks in France. But scientists have voted to change the kilo’s official definition to a mathematical equation based on unchanging laws of physics. For this reason, the prototype kilogram, called “Le Grand K” will no longer be the official definition of the kilogram. Plus, learn the English phrase “seal someone’s fate.”
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The Expressions are back!
Subscribe to our new podcast, "Essential English Expressions." Each episode shows you step-by-step how to use a common English expression, with plenty of examples. Season 1 is available now. Download or stream all 14 episodes at [link].