Discovery of X-rays (1895)
On November 8, 1895, German physicist Wilhelm Conrad Röntgen, experimenting with a cathode-ray tube in his laboratory at the University of Würzburg, noticed a fluorescent screen glowing nearby even though the tube was covered. He had found a new kind of penetrating radiation, which he called "X" rays because their nature was unknown. Within weeks he had made an X-ray image of his wife's hand, and in 1901 he received the first Nobel Prize in Physics.