John Lennon released his second album, “Imagine.”
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Queen Elizabeth II became Great Britain's longest-reigning monarch in history.
With a record time of 2:52:29, Armas Toivonen was the first European to win gold for a marathon at the European Athletics Championships.
American astronomer Edward Emerson Barnard discovered Jupiter's fifth moon.
Grace Hopper fell victim to the first-ever computer bug after removing a moth from her Harvard Mark II computer.
Tajikistan declared its independence from the Soviet Union.
