Bank of Tokyo and Mitsubishi Bank merged to become the world’s largest bank.
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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 Treaty of Florence was signed, which ended the war between the French Republic and the Kingdom of Naples.
The term ''Big Bang" was coined by Fred Hoyle in a radio interview.
A nuclear disaster occurred at Three Mile Island in Pennsylvania, US.
