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TIL after a causeway was constructed in 1959, the northern half of the Great Salt Lake in Utah turned red. A red-colored bacteria called halophilic bacteria flourishes in areas with high salinity, and the region north of the causeway is no longer fed by freshwater.

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7rx8p TIL that the Mantis Shrimp has one of the best eyesights in the animal kingdom. It’s hexnocular vision is so powerful that it sees six images at once, sees in 12 colors, and can polarize its own light. Scientists are now modeling its capabilities to detect cancer and internal injuries in humans.
BVbx TIL that left and right headlights are not symmetrical, by law.
69QeY TIL that that one song associated with clowns was called "Entry Of The Gladiators", and was intended to be a marching song.
ryex TIL there was a song written in the 1630s that was performed only in the Sistine Chapel. The Vatican kept the composition of the piece secret for 150 years until the 14-year-old Mozart listened to the piece two times, transcribed it from memory, and produced the first unauthorized copy of the song.
NVZM TIL after the french revolution, France briefly used a new calendar based on a decimal system; 10 days a week, 10 hours a day, 100 minutes per hour and 100 seconds per minute, and starting at Year 1.