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Wilhelm Röentgen, a German mechanical engineer, discovered the x-ray, which was soon after used put to use in the medical field.
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Pierre Curie, Marie Curie, and Henri Becquerel won the Nobel Prize in Physics. This was when Marie Curie coined the term radioactive.
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Marie Curie won the Nobel Prize in Chemistry for the discovery of polonium and radium.
https://docs.google.com/document/d/1X7TDkWjgCoTESl6Q30gLlVXsGkXo4sGkhjuuCtd-H84/edit -
Tho-Radia, a brand of French radioactive beauty products, was launched by Dr. Alfred Curie and Alexis Moussali.
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Otto Hahn and Fritz Strassman, German scientists, were able to use neutrons to split the nucleus of a uranium atom, which released energy; people began trying to convert that released energy into bombs.