Edward & Sarah Bishop and seven others were examined by Magistrates in Salem, Massachusetts, for witchcraft.
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The final gasps of the Crab Head nebula were observed as it went supernova.
Adolf Hitler and Benito Mussolini met in Salzburg, Austria.
The German army used chlorine gas for the first time.
The US Congress passed legislation that allowed the 'In God We Trust' inscription on the currency.
Twenty million Americans mobilized to call for greater protections for our planet. This became the world's first Earth Day.
