Adolf Hitler made plans to invade Britain starting on September 21, 1940.
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The Viking 2 became the second spacecraft to land on Mars.
The United States and Great Britain signed the Treaty of Paris, ending the Revolutionary war.
Sir Malcolm Campbell broke the world record speed exceeding 300 mph on the Bonneville Flats, Utah, US.
A record-breaking haircut saved a sheep that had not been sheared in over five years in Canberra, Australia.
Frederick Douglass escaped slavery in the US.
