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TIL the term leap year probably comes from the fact that a fixed date in the Gregorian calendar normally advances one day of the week from one year to the next, but the day of the week in the 12 months following the leap day will advance two days due to the extra day, thus leaping over one day.

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XEBrX TIL that in US food labeling, the term "natural" essentially means nothing and does not ensure that the product is unprocessed or all natural in any way.
0dabv TIL Beethoven was challenged to a piano duel by pianist Daniel Steibelt, who tried to bend the rules by handing Beethoven a Cello and Piano piece instead of just a Piano piece. Unfazed, Beethoven turned the score upside down, played it, then improvised on the inversed themes for half an hour.
OoQd7 TIL the 1st season of the kids show Courage the Cowardly Dog ended with the main character (Courage) becoming a puppeteer for his owners (the two main protagonists)'s lifeless bodies after they were turned into marionettes. He goes mentally insane from living alone after a while.
mxe1o TIL the wounded warrior project only gives 60% of their profits back, compared to their counter parts who donate 90%+
WKP8 TIL the shape of the first supersonic airplane, the Bell X-1, was based on the Browning .50 caliber machine gun bullet, which was known to be stable in supersonic flight.