Thallium
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William Crookes
Society for Psychical Research
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History of radio
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Parapsychology
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Protactinium
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N-ray
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March 30
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June 17
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Helium
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Ernest Rutherford
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Electron
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Europium
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Timeline of chemical element discoveries
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Crookes radiometer
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Cathode ray
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Cathode ray tube
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Actinide
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Afterlife
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Mendeleev's predicted elements
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Pinhole camera
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List of chemists
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List of inventors
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J. J. Thomson
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Timeline of historic inventions
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Chemical symbol
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Langmuir probe
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Wilhelm Röntgen
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Imperial College London
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Timeline of electromagnetism and classical optics
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Timeline of states of matter and phase transitions
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Henri Becquerel
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1832
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1861
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1919
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Sir William Crookes
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