A Christian Alliance Breaks the Ottoman Siege of Vienna
On September 12, 1683, a Polish-led relief army broke the Ottoman siege of Vienna, ending Turkish expansion in Europe.
Leo Szilard Conceives the Nuclear Chain Reaction
On September 12, 1933, Leo Szilard conceived the nuclear chain reaction while crossing a street in Bloomsbury, London.
Prehistoric Cave Paintings Are Found at Lascaux
On September 12, 1940, teenagers discovered the Lascaux cave paintings in France, some of the finest prehistoric art known.
German Commandos Rescue Benito Mussolini
On September 12, 1943, German commandos rescued Mussolini from house arrest on the Gran Sasso in central Italy.
Jack Kilby Builds the First Working Integrated Circuit
On September 12, 1958, Jack Kilby ran the first working integrated circuit, putting every component on one piece of semiconductor.