Lynne and William Jolitz released the Unix-like operating system 386BSD.
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Batman's 'The Dark Knight' premiered in London.
Alpinists reached the summit of Matterhorn for the first time.
Ferrari secured its first Grand Prix victory at the 1951 British Grand Prix.
Harper Lee's second novel, 'Go Set a Watchman,' was published.
American outlaw Billy the Kid, also known as William H, Bonney was shot dead by police.
