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X-rays were discovered by accident.
While experimenting with cathode rays covered by thick cardboard in 1895, Wilhelm Röntgen noticed a light being cast on a fluorescent board across the room. The first X-ray was of the hand of his wife, who saw the image of her bones and exclaimed ‘I have seen my death!’
So he named them X-rays, using an ‘X’ to represent their mysterious nature.
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source https://earn8online.com/index.php/147529/did-you-know-x-rays-were-discovered-by-accident-while/
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