The Battle of Lexington and Concord began, which kicked off the American Revolutionary War between 1775 & 1783.
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NASA's Ingenuity helicopter became the first helicopter to fly on another planet.
NetherRealm's Mortal Kombat, the first game in the franchise reboot, was released for PS3 and Xbox 360.
Prolific killer Charles Manson was sentenced to death by gas chamber.
Charles Darwin, who taught the world the theory of evolution by natural selection, died at 73 years old.
The Warsaw Uprising involved Jews in the Warsaw Ghetto resisting Nazi Germany during WWII.
