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TIL the Russian army only started to issue socks in 2013. They used a portyanki, a foot wrap for the past 300 years

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awYrb TIL Part of the reason we sigh is because the alveoli in the lungs collapse with disuse, and a sigh pops them back open by taking in more air. Humans average about 12 sighs an hour, and without them our lungs would fail.
LMbm TIL Sally Ride (the first American woman in space) was a lesbian. It was only after her death that her 27 year relationship with Tam O'Shaughnessy was revealed by Ride’s sister (a minister).
JYok8 TIL: The rarest eye and hair color combination in the world is blue and ginger, only 0.17% of the population have this combination.
BB6W TIL that chickens have a three digit hand and a tail while in embryo and genes trigger their re-absorption. Scientists are trying to isolate and deactivate these to create a chickenosaurus.
W7eb4 TIL that US Olympic swimmer Iris Cummings is not only the last surviving athlete of the 1936 games, she was a WASP pilot in World War II and flew fighter planes.