Now to a story that's taken a weight off some scientists' shoulders...

Scientists from 60 nations have gathered in France and cheered after making the landmark decision to overhaul the way the value of a kilogram is assessed.

Al Jazeera’s Neave Barker reports from Versailles, on the outskirts of Paris, about what it all means.

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Associated Press 25 May 2019 14:22 CEST

Today in History May 25