Adolf Hitler made plans to invade Britain starting on September 21, 1940.
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Sweden switched from driving on the left side of the road to the right side.
John Brallier became the first openly paid professional American Football player when he was paid $10 to play a match.
Holocaust diarist Anne Frank was transported to Auschwitz, along with over a thousand other Jewish prisoners.
John Lennon and Yoko Ono left the UK and headed to New York City, US.
Dennis Villeneuve's adaptation of Frank Herbert's Dune premiered at the Venice Film Festival.
