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TIL of the Mesoamerican Long Count Calendar, a continuously running calendar used on monuments, and that started on creation day, August 11, 3114 BCE.

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6E8xW TIL Count Juan Raphael Dante, a director of the US Karate Association until 1962, didn't like the focus on ceremony, tradition, and protocol, over "effectiveness", so he created the "Dance of Death" system, taught in a mail-order booklet, World's Deadliest Fighting Secrets, advertised in comic books
Brrgx TIL that a janitor from Chicago wrote over six years a 15,145-page fantasy manuscript with over 300 watercolor illustrations called “In the Realms of the Unreal”, which was only discovered after his death.
XA1R TIL that footage of Jazz being thrown out of the house on ‘Fresh Prince’ was only filmed once. The actor was to wear the same clothes on episodes he is thrown out to avoid continuity issues.
8albP TIL that Transparent Aluminum is a real thing -- Aluminum Oxynitride (AlON) is a ceramic composed of aluminium, oxygen and nitrogen.
KOB6R TIL of William Walker, an American lawyer who raised an army of 45 men and managed to conquered Baja California for a short time. He went on to try and conquer Nicaragua three times, once successfully. Later he tried to conquer some islands that were about to be returned to Honduras from Britain.