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TIL flags are flown at half-mast because the invisible flag of death is flying at the top.

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6VBX TIL Roger Ebert dated Oprah
b9JWj TIL A needlegun is a firearm that fires small, sometimes fin-stabilized, metal darts or flechettes. Theoretically, the advantages of a needlegun over conventional projectile firearms are in its compact size, high rate of fire, and extreme muzzle velocity.
LKMP TIL in 1979 Jimmy Carter installed solar panels on the White House, saying, “In the year 2000 this solar water heater… can either be a curiosity, a museum piece, or can be a part of one of the greatest adventures ever undertaken by the American people.” They are now in a museum in China.
oRyjo TIL of Hugo Gernsback. Among other things, The Hugo Awards were named after him. He founded Amazing Stories, the first sci-fi magazine, in 1926. He even received his own Hugo Award in 1960.
1jrD TIL Great White Sharks sometimes regurgitate a bite to make room for a more calorically-rich morsel, evidence that white sharks are adept at assessing the caloric value of their food and are selective when feeding.