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World War II: Operation Biting launches its overnight raid on the German coastal radar station at Bruneval to retrieve a Würzburg installation.
Martin Kamen and Sam Ruben discover carbon-14.
Born: Roger Mahony, American cardinal.
Reichstag fire: Germany's parliament building in Berlin, the Reichstag, is set on fire; Marinus van der Lubbe, a young Dutch Communist claims responsibility.
United States representative Daniel Sickles, after learning of an affair between his wife and United States Attorney Philip Barton Key II, murders him in Washington, D.C.
Died: Conrad the Elder, Frankish nobleman.
The University of Constantinople is founded by Emperor Theodosius II at the urging of his wife Aelia Eudocia.
Edict of Thessalonica: Emperor Theodosius I and his co-emperors Gratian and Valentinian II declare their wish that all Roman citizens convert to Nicene Christianity.