The fourth largest diamond was found in Karowe Mine, Botswana.
The diamond was named Lesedi La Rona and is 1.11 carats.
Source
The Model M Postage Meter was put into commercial use.
Queen Elizabeth II had hip surgery at King Edward VII Hospital.
Rapper Dr. Dre released his second album, 'The Chronic 2001.'
Oklahoma became the 46th state to join the United States of America.
The first edition of America's oldest newspaper, The New York Evening Post, was published.