The final gasps of the Crab Head nebula were observed as it went supernova.
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The German army used chlorine gas for the first time.
A controversial bill to send asylum seekers to Rwanda was approved by the UK's parliament.
The US Congress passed legislation that allowed the 'In God We Trust' inscription on the currency.
President Richard Nixon died of a stroke at the age of 81.
Michael Moorer claimed the heavyweight boxing title after smashing Evander Holyfield in Paradise, Nevada, US.
