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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:

The History of the Atom

ByKane Anderson
21 Sep 2017
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Date:

jan 15, 1898
Now
~ 128 years ago
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