The Chernobyl power plant in Ukraine exploded, killing 31 people and spreading contamination across Western Europe.
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Astronomer Nicolaus Copernicus made his first observation of Saturn.
Great Britain claimed South Georgia Island after Argentina surrendered following the Falklands War.
The first major mass trials of polio vaccines began.
The Handmaid's Tale debuted on Hulu.
The Treaty of London was signed by Italy, Britain, France, and Russia.
