What you didn't know about St. Patrick's Day... the luckiest day of the year!
Believe it or not, the color of St. Patrick was not actually green, but blue! In the 19th century, however, green came to be used as a symbol for Ireland.
The guillotine is first used, American and Soviet troops cut Nazi Germany in two, a U.S. Navy submarine completes the first submerged circumnavigation of the globe, and the Hubble Space Telescope is launched, all on this day.
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