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15

TIL that Vatican tradition forbids performing an autopsy on a pope after death.

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XwVE TIL British grenades in WWI originally had a timer of seven seconds, but that was found to be too long as it gave the Germans time to throw the bomb back. Therefore, the time was reduced to four seconds.
l7NX7 TIL that a "culture bound syndrome," or "folk illnes," is a set of psychiatric symptoms that only presents itself in a particular society. One such example is Amok Syndrome from Indonesia, from which we get the term "running amok"
p8mdp TIL there are about 2,200 miles of navigable canals in the United Kingdom requiring many tiny locks to be manually operated and many of them no wider than 7 feet (2.1m). Started for use as commercial transport in the early 19th century it has now turned into a leisure highway of "narrowboats."
a8D7M TIL that some elevators have undo commands if you press the wrong button
8e0Qa TIL: There existed elephant duels in SE Asia. Opposing army leaders of equal status would face each other on the battlefield in single combat atop elephants. It was seen as honorable and heroic as it avoided troop losses. The practice died when the Portuguese introduced guns in the 16th century.