The discovery of X-rays revolutionized medicine. And this discovery was made by the German physicist Wilhelm Röntgen almost by accident. On November 8, 1895 Roentgen was about to close his lab for the night when a strange greenish glow of a paper screen coated with barium crystals caught his eye, it lay not far from a cathode ray tube. The tube was covered with thick black cardboard, and the scientist concluded that the glow was caused by some unknown type of rays which he later called X-rays. Having spent several months examining them, he discovered that those rays could pass through objects.
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