Wyoming’s Grand Teton National Park was established after being signed off by President Calvin Coolidge.
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The Roman Inquisition ordered Galileo not to teach or defend his theory that Earth and other planets revolve around the sun.
In Svalbard, Norway, the Global Seed Vault celebrated its 10th anniversary by adding its one-millionth seed.
The UK had its first Grand National Steeplechase at Aintree Racecourse in Liverpool.
Robert Watson-Watt demonstrated radar in Slough, England, UK.
Valentinian I, also known as Valentinian the Great, ascended to the throne as the Roman emperor.
