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William Herschel, a British astronomer, discovered infra-red radiation (heat waves).
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German chemist Johann Ritter discovered UV radiation.
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James Maxwell, a British scientist, predicted the existence of continuous EM waves.
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German scientist Heinrich Hertz discovered radio waves.
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German physicist Wihelm Roentgen discovered x-rays.
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French physicist Henri Becquerel discovered radioactive rays emitted by uranium.
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Marie Curie discovered radium.
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Frenchman Paul Villard discovered gamma rays.