The fourth largest diamond was found in Karowe Mine, Botswana.
The diamond was named Lesedi La Rona and is 1.11 carats.
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Due to mosquito infestations, the city of Havana was relocated to its final location.
Oklahoma became the 46th state to join the United States of America.
The Model M Postage Meter was put into commercial use.
The Skylab 4 mission was launched by NASA, taking a crew of three astronauts to the US space station.
Rapper Dr. Dre released his second album, 'The Chronic 2001.'