The UK issued a new 12-sided £1 coin into circulation.
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Roman Emperor Valentinian I made his brother, Flavius Valens, his co-emperor.
The strain of swine flu known as H1N1 had its first case in the US.
The world's first weightlifting championship took place in London, England.
Frenchman Henri Fabre flew the world's first seaplane in Martinique, France.
A nuclear disaster occurred at Three Mile Island in Pennsylvania, US.
