Edward & Sarah Bishop and seven others were examined by Magistrates in Salem, Massachusetts, for witchcraft.
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Pyotr Ilyich Tchaikovsky composed his 'Swan Lake' ballet.
The German army used chlorine gas for the first time.
The final gasps of the Crab Head nebula were observed as it went supernova.
Twenty million Americans mobilized to call for greater protections for our planet. This became the world's first Earth Day.
Adolf Hitler and Benito Mussolini met in Salzburg, Austria.
