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TIL the longest time served in prison by someone who was later exonerated was 48 years

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YpKdP Today I learned that the first hijacking of an airplane was by a South African and three Kiwis during WWII
l7XDr TIL that universal peace symbol comes up from merging letters "N" and "D" of the flag semaphore, standing for "nuclear disarmament".
lda TIL that the world’s 15 largest shipping vessels produce more air pollution than all of world’s 750 million cars.
5YoD TIL that a live conch is essentially a large claw-like appendage with a small set of eyes and a mouth attached.
Do9e TIL Ocean thermal energy conversion, a technology invented at the end 19th century, has the potential to satisfy twice the global electricity demand without affecting the temperature of the ocean or the world’s environment.