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TIL Reykjavik’s City Council decided to turn off city lights in order to allow residents to enjoy a fantastic Northern Lights display without artificial light pollution.

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x8v1 TIL in March 1992, after Southwest just started using the “Just Plane Smart” motto, Stevens Aviation, who had been using it for their motto, threatened a trademark lawsuit. Instead of a lawsuit, the CEOs of both companies staged an arm wrestling match for the use of the phrase.
awLn9 TIL That some species of anemone can swim to escape predators.
160J7 TIL that during World War II, Japan launched “Kikusui” or “Floating Chrysanthemum,” a campaign using balloon bombs to target the U.S. These bombs aimed to cause damage and instill fear. While most failed, one incident in 1945 resulted in the deaths of six people in Oregon.
XvdE TIL of DI-X, a drug intended for Nazi soldiers that allowed test subjects to march up to 55 miles before collapsing.
jNA9M TIL "Picchu", as in "Machu Picchu" is meant to be read as "Pick-chu", not "Pea-chu" as most pronounce it. This is why the word has two "c"s whereas Machu only has one.