John Hinckley, who tried to kill President Reagan, was found not guilty on the grounds of insanity.
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Carl Nassib became the first openly-gay NFL player to play a regular-season game.
Two newly discovered moons orbiting Pluto were named Nix and Hydra.
Cyrus McCormick patented the reaping machine.
Manchester Mark I computer became the first stored computer to run a program at a lab at Manchester University, UK.
The British Army defeated Irish rebels at the Battle of Vinegar Hill.
