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    Röntgen, Discovers X-rays, 1895  
Wilhelm Conrad Röntgen was a German physicist, of the University of Würzburg, who, on November 8, 1895, produced and detected electromagnetic radiation in a wavelength range today known as x-rays or Röntgen Rays. Röntgen's discovery of x-ra...
 
    Antoine Becquerel, Evidence of Radioactivity  
Antoine Henri Becquerel was a physicist, Nobel laureate, and the first person to discover evidence of radioactivity. For work in this field he, along with Marie Curie and Pierre Curie, received the 1903 Nobel Prize in Physics. The SI unit f...
 
    Madame Curie, Discovery of Radioactivity  
Marie Sklodowska Curie was a Polish and naturalized-French physicist and chemist who conducted pioneering research on radioactivity. She was the first woman to win a Nobel Prize, the first person and only woman to win twice, the only person...
 
    Otto Hahn, Father of Nuclear Chemistry  
Otto Hahn was a German chemist and pioneer in the fields of radioactivity and radiochemistry. He was exclusively awarded the Nobel Prize in Chemistry in 1944 for the discovery and the radiochemical proof of nuclear fission. He is referred t...
 
    Arthur Holmes, Plate Tectonics, Age of the Earth  
Prof Arthur Holmes was a British geologist who made two major contributions to the understanding of geology. He pioneered the use of radiometric dating of minerals and was the first earth scientist to grasp the mechanical and thermal implic...
 
       
         
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