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December 21st: Pierre and Marie Curie Discover Radium


This Day In History: December 21, 1898 On this day in history, 1898, Marie and Pierre Curie discovered the radioactive element radium (in the form of radium chloride), extracting it from uraninite.   They first removed the uranium from the uraninite sample and then found that the remaining matter was still radioactive, so investigated further.  Along with the barium in the […]

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