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Radioactivity

In 1896, physicist Henri Becquerel was trying to get fluorescent materials to produce X-rays by leaving them in the sun. His experiment, however, suffered a week of cloudy, overcast skies. After leaving all of his materials in a drawer, he returned one week later to find that the uranium rock he had left there had managed to imprint its image on a nearby photographic plate without any exposure to light.

 

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Many Inventions Have Actually Been Accidental
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