The strain of swine flu known as H1N1 had its first case in the US.
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Roman Emperor Valentinian I made his brother, Flavius Valens, his co-emperor.
The world's first weightlifting championship took place in London, England.
Stanley Kramer became the first person to receive a star on the Hollywood Walk of Fame.
A nuclear disaster occurred at Three Mile Island in Pennsylvania, US.
Frenchman Henri Fabre flew the world's first seaplane in Martinique, France.
