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TIL that the grading system used by schools in the United States is A, B, C, D, or F because teachers were concerned that students and parents would think "E" stood for "Excellent" in an A, B, C, D, E system.

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via reddit.com

pYm8e TIL that a misreading of Persian-derived babr (tiger) as misspelled Russian bobr (beaver) led to a flag having a tiger-beaver hybrid
BrpxK TIL of the "Tree of Life" in Bahrain: an isolated 400-year-old mesquite tree in the middle of the desert sustaining itself from an unknown water source
MeEYa TIL NASA as a practical joke played Hello Dolly to wake the Gemini 6 crew in 1965. The astronauts loved it and a tradition was born. Until 2011, families were allowed to choose a favorite song to wake up their loved one in space.
alBM TIL 99% of Rollercoaster Tycoon was programmed in Assembly single-handedly by one guy
Jdj1 TIL that mullets are illegal in Iran.