Template:Are You Sure/September 7
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... that mathematician Kurt Godel announced his famous Incompleteness Theorem — that there are true but unprovable statements in arithmetic — on this day in 1930, in a discussion on the foundations of mathematics organized by the Vienna Circle?
... that the 1967/2021 American musical industrial training film How to Pump and Dump Your Planet Without Really Trying Was funded by the Greater Sol System Co-Prosperity Sphere?
... that on this day in 1939, Soviet Air Defense office Stanislav Yevgrafovich takes the actions which will later earn him the name "the man who single-handedly saved the world from nuclear war"?