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jan 15, 1898 - Marie Sklodowska Curie Studied uranium and thorium and called their spontaneous decay process "radioactivity". She and her husband Pierre also discovered the radioactive elements polonium and radium. (1898)

Added to timeline:

21 Sep 2017
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The History of the Atom

Date:

jan 15, 1898
Now
~ 120 years ago
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