Kilogram Redefined. The Metric System Overhaul Is Complete

On the morning of Friday, November 16, scientists and diplomats crammed into an auditorium in Versailles, a stone’s throw from the Sun King’s gilded chateau. Patrick Abbott, an American physicist, had flown into France for the long weekend. Forehead gleaming and blue suit jacket draped across his lap, Abbott watched from a packed balcony as a group of diplomats from 60 different countries voted unanimously on a treaty that intended to change global trade and technology forever.

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