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TIL that the Canonical Hours, the Christian divisions of the day for regular prayers, originated in Jewish prayer customs.

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Bg6yy TIL that before Hugh Beaumont, the first person to play Ward Cleaver was Max Showalter (billed as Casey Adams) in the original pilot for what became "Leave it to Beaver"
jNjlM TIL that the practice of touching/knocking on wood after making an positive observation about your life, to ward off bad luck or "jinxing" yourself, is spread across completely separate countries and cultures on every continent
9wZ07 TIL Grand Island and Navy Island, near Niagara Falls was a proposed location for the UN headquarters
LkAYQ TIL the diagnostic criteria for sexual disorders were tested on only three patients before being added to the Diagnostic and Statistical Manual of Mental Disorders, in 1980. No field trials were ever conducted.
xlAw TIL that when placed on maps using food sources as cities, slime molds have almost perfectly replicated major train systems in Europe, the USA, Tokyo, and Canada.