The Chernobyl power plant in Ukraine exploded, killing 31 people and spreading contamination across Western Europe.
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A Texas resident narrowly avoided a felony after forgetting to return a VHS rental tape after 22 years.
Ariel 1, the first British-American satellite, was launched from Cape Canaveral in Florida, US.
The official secret police force of Nazi Germany, the Gestapo, was established.
The Treaty of London was signed by Italy, Britain, France, and Russia.
William Shakespeare was baptized in Stratford-upon-Avon, Warwickshire, England.
