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TIL The whale tail on cruise ships is designed to direct diesel exhaust over the stern and away from the passengers.

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Brg8W TIL that Byzantium not only developed sophisticated systems for taxation, justice, administration, and military deployment, but is also rarely credited with refuting Aristotle’s theory of falling bodies, one thousand years before Galileo.
p8wvp TIL: Sacha Baron Cohen offered to pay fines for six Czech tourists who were arrested in Kazakhstan for wearing nothing but 'Borat' inspired mankinis.
raLM TIL: in 1954, a man committed suicide by jumping off the Golden Gate Bridge, his suicide note simply read “Absolutely no reason except I have a toothache.”
6QPX TIL that U.S. schoolchildren used to say the Pledge of Allegiance using the “Bellamy salute” (more recognizably the salute used by Hitler and the Nazis). In order to prevent further confusion or controversy, US Congress instituted the hand-over-the-heart gesture.
5VQOn TIL about the thymus, a small (1 oz.) organ behind the sternum that trains new white blood cells to NOT attack the body's own cells. Only 2% survive this rigorous training program; the rest commit suicide to prevent themselves from attacking friendly cells.