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What did Wilhelm Roentgen invent?

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Wilhelm Roentgen invented the use of cathode rays to take X-rays of the body in 1895, according to About.com. Roentgen was honored for his discovery by receiving the Nobel Prize in physics in 1901.

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What did Wilhelm Roentgen invent?
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Roentgen documented his accidental discovery by using the rays to take a photograph of his wife's hand, the first X-ray ever performed, according to the Nobel Prize Foundation. He used the letter "X" when he named the discovery "X-ray" because so much about the concept was unknown. Roentgen declined to seek a patent for his invention, stating he wished for the world to have free access to this important technology.

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