“20 April 1902: Marie and Pierre Curie proved the existence of radium by isolating radium chloride” from HistoryPod.net by HistoryPod.net.
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11th November 1918: WW1 Armistice of Compiègne is signed
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1st September 1939: Nazi Germany invades Poland
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9th November 1989: East Germany opens the Berlin Wall
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