President Richard Nixon died of a stroke at the age of 81.
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The German army used chlorine gas for the first time.
The final gasps of the Crab Head nebula were observed as it went supernova.
General Laborer Thomas Stevens started his first bicycle trip around the world.
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.
