Valentinian I, also known as Valentinian the Great, ascended to the throne as the Roman emperor.
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The HMHS Britannic, sister to the RMS Titanic, was launched at Harland and Wolff shipyard in Belfast.
British Prime Minister Winston Churchill went public that Britain had its first atomic bomb and planned to test it in Australia by the end of the year.
The Roman Inquisition ordered Galileo not to teach or defend his theory that Earth and other planets revolve around the sun.
The New York Philharmonic Orchestra performed in Pyongyang, North Korea.
Oprah Winfrey was declared not guilty after cattlemen tried to sue her for saying American beef could spread mad cow disease.
