Death of Wolfgang Pauli (Austrian-Swiss physicist, Nobel laureate), December 15, 1958. Wolfgang Pauli was a leading figure in twentieth-century theoretical physics, best known for formulating the Pauli exclusion principle, which played a crucial role in the development of quantum mechanics. Born in Vienna in 1900, Pauli completed his studies at the University of Munich. In 1945, he was awarded the Nobel Prize in Physics for the discovery of the exclusion principle, which explains the structure of atoms and the behavior of electrons. Throughout his career, Pauli collaborated with prominent scientists such as Albert Einstein and Niels Bohr, leaving a significant mark on the advancement of theoretical physics. He was also known for his scientific rigor and constructive criticism within the scientific community. Pauli died on December 15, 1958, in Zurich, Switzerland. Following his death, the international scientific community commemorated his legacy through articles and gatherings that honored his scientific achievements. This date serves as a reminder of Pauli's important contributions to physics and his role in shaping fundamental theories of quantum mechanics. This observance was added to the Gregorian calendar from 1958 onward to honor Pauli's scientific significance and influence on the history of science, with the primary purpose of recognizing his role in advancing physics and raising awareness of his scientific accomplishments.