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TIL that a Water Salute is a ceremony in which an aircraft passes under one or more arches formed by the water jets from airport fire fighting vehicles. They are used to mark notable events such as the retirement of senior pilots or air traffic controllers.

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x6Ldb TIL that a pear is one of the few fruits that does not ripen on the tree. The pear is harvested when it is mature, but not yet ripe, and, if left at room temperature, it slowly reaches a sweet and succulent maturity as it ripens from the inside out.
6EbwJ TIL Owls don't have eyeballs, they have eye tubes.
mO7p TIL In 1770, the British Parliament passed a law condemning lipstick, stating that “women found guilty of seducing men into matrimony by a cosmetic means could be tried for witchcraft.”
rAM4 TIL that you can embed secret messages in vocal music that emege only when multiple people start singing
nenVo TIL that Queen's 1985 Live Aid performance (seen at the end of the Bohemian Rhapsody movie) was voted the greatest live performance in the history of rock. Jimi Hendrix's appearance at Woodstock in August 1969 came second, followed by the Sex Pistols in 1976.