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TIL Auld Lang Syne served as the national anthem of the Korean exile government and from 1945 to 1948, it was the melody of South Korea's national anthem.

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8aD7P TIL a soldier in Napoleon's army invented "night writing" in the early 1800s so soldiers could communicate safely in the dark. It was then adapted and perfected by Louis Braille to give us the tactile writing system known as "Braille", which is used by vision impaired persons worldwide.
AbEa TIL that the estimated number of individual insects currently hopping, crawling or flying around our planet at any given moment is about 10 quintillion, meaning there are about 2 billion insects for every human being.
Ypa1x TIL that the Mississippi River has been forced through New Orleans artificially by a series of floodgates. If they fail it will shift course 85 miles west and make America's largest port effectively useless overnight.
xKxg TIL, after the American Revolution from the British, in 1777, Morocco was the first country to recognize the United States of America. The treaty is still in force, constituting the longest unbroken treaty in U.S. history.
eZ9n TIL of a Dutch nursing home which provides free housing to college students in return for being good neighbors, interacting with older residents, attending parties, etc to ward off loneliness and depression common in the elderly.