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TIL that an early application of the "Buddy System" was used to prevent trench foot in WWI. Rather than each soldier being responsible for just their own feet, they and their assigned buddy were jointly responsible. Trench foot rates dropped significantly with this innovation.

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QJk0d TIL that a Pyrrhic victory is a victory that inflicts such a devastating toll on the victor that it is tantamount to defeat.
eaxg TIL that the little membrane at the inner corner of the eye is a vestigial remnant of a nictitating membrane, aka transparent eyelid, present in fishes, birds and reptiles today.
R7E67 TIL the idea that female fertility dramatically drops at 35 is inaccurate and based on a 19th century study. Modern studies show women over 45 still have an up to 50% chance of getting pregnant.
DQaXg TIL China, virtually closed to Americans for over a decade, opened its doors to a Danish author from National Geographic for a lengthy tour conducted by communist officials in 1964
oR1gE TIL of Kenkanryu (Hatred of the Korean wave), an anti-Korean manga released in 2005 by a Japanese nationalist criticising controversial Korean-Japan issues including comfort women, Liancourt rocks etc. from a pro-Japan perspective