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TIL the US military once tried to build a radar detector-detector-detector detector in order to detect radar detector-detector-detectors, whose main purpose is to detect a radar detector detector, which were built to alert police to someone using an illegal radar detector

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D10GP TIL of “The Milk”. In 1994, a student at MIT bought a carton of milk but forgot to use it, and rediscovered it 10 months later. Instead of binning it he threw a ‘birthday’ for it. A cult following developed for this legendary expired dairy product. In 2015 it celebrated its 21st birthday.
EgJZd TIL that bones of fallen Waterloo battle' soldiers (and horses) may have been used to whiten brown sugar into refined white sugar for decades
VMKwZ TIL that before 1954, stop signs used to be yellow with black lettering. This was because there was no red dye that would not fade over time. However, by 1954, sign makers began using a fade-resistant porcelain enamel, and it was declared that stop signs would be red with white lettering.
wr08 TIL Mozart had a “startling fondness” for poop jokes, which is preserved in his surviving letters.
P140e TIL T.E. Lawrence's (Lawrence of Arabia) death in a motorcycle accident made one of his doctors study what he saw as the unnecessary loss of life by motorcycle despatch riders through head injuries which led to the increased use of crash helmets by both military and civilian motorcyclists