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TIL that the disappearance of D. B. Cooper remains the only unsolved air piracy case in commerical aviation history.

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0wpbL TIL Parasite (parasitus) was an accepted role in Roman society, in which a person could live off the hospitality of others, in return for "flattery, simple services, and a willingness to endure humiliation".
MJWm TIL that swearing increases your pain threshold.
E1GgW TIL Lower respiratory tract infections (LRTI's) are the fifth-leading cause of death and the leading infectious cause of death
4ENJ TIL North Korean tunnels exist under the DMZ, apparently designed for a surprise attack on Seoul. 4 have been discovered since the 1970s, but there are suspected to be up to 20 more.
PeEg TIL The Great Wall of China isn’t really visible from space - it’s just a myth.