German Scientist Discovers X-Rays by Mistake

1895: German physicist Wilhelm Roentgen is working in his laboratory in Würzburg when he accidentally discovers the X-ray.
Roentgen was conducting experiments with a Crookes tube – basically a glass gas bulb that gives off fluorescent light when a high-voltage current is passed through it – when he noticed that the beam turned a screen 9 feet away a greenish fluorescent color, despite the tube being shielded by heavy black cardboard.

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