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In 1904, Niels Ryberg Finsen, a renowned Danish physician and scientist, passed away. Finsen gained prominence for his contributions to the field of phototherapy, pioneering the use of concentrated light rays to treat various medical conditions. His notable achievements include the groundbreaking application of ultraviolet light in treating lupus vulgaris, a type of skin tuberculosis, for which he was awarded the Nobel Prize in Physiology or Medicine in 1903.