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TIL: Tear gas cannot be used in war by militarily because it is a chemical weapon, but it can be used by police

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ANPLo TIL During World War II, a Great Dane named Juliana was awarded two Blue Cross Medals.
ognW TIL that the World Health Organization listed homosexuality as a mental illness until the 17th May 1990.
e0jQk TIL In 1858, Swiss astronomer Johann Rudolf Wolf published his formula for determining the daily sunspot number: k(10g + f); where g is the number of sunspot groups; f is the number of individual sunspots; and k is a calibration factor, different for each observer
AOXa TIL There are structures off a Japanese island that may have been made by man, but no one knows by whom or when
X0BvE TIL that Son Heung-min, captain of both the South Korean national team and Tottenham Hotspur, completed basic training with the Republic of Korea Marine Corps—finishing in the top five out of 157 trainees. He also learned German by watching episodes of SpongeBob SquarePants