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TIL: In the American Civil War both sides employed logs which were carved, painted and mounted to look like cannons at a distance. This gave the impression that a fort or strong point was better armed than it actually was. They were called "Quaker Cannons" and repeatedly proved effective.

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WQwL TIL powdered water exists.
v1xEB TIL: Some scientists say certain objects' unexpected orbits must be due to the presence of a gigantic planet beyond the solar system's Pluto. However, an emerging theory says the region's gravitational anomalies are better explained if the proposed object instead is a tiny early-stage black hole.*
QNb1X TIL of death flights, a form of extrajudicial killing in which captives are thrown out of planes or helicopters and later reported as "missing", most notable for being used by Argentine Junta during the 1976-1983 Dirty War.
DQY8D TIL about the SS Île de France, the last civilian ship to leave France before the outbreak of WWII. It successfully transported 1,777 passengers fleeing from France to New York; while crossing the Atlantic, 16 other vessels were sunk by torpedoes, mines, or gunfire.
yVdAV TIL that each of the characters in Gilligan's Island represented one of the seven deadly sins