20 April 1902: Marie and Pierre Curie proved the existence of radium by isolating radium chloride 5th April 2018 https://www.historypod.net/wp-content/uploads/2018/04/04-20-Marie-and-Pierre-Curie-chemically-isolated-pure-radium-chloride.mp3 “20 April 1902: Marie and Pierre Curie proved the existence of radium by isolating radium chloride” from HistoryPod.net by HistoryPod.net.
5th February 1958: Nuclear bomb lost off Tybee Island in Georgia, USA after an in-air collision 5th February 2021
7th April 1954: President Eisenhower first described the ‘domino theory’ of the spread of communism during a news conference 7th April 2021
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