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TIL that the silhouette of Snow White's castle is based on the real life Alcázar of Segovia

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e0W16 TIL that 'unblocking your ears' / (pinching your nose and exhaling) is called the "Valsalva maneuver"
oRekA TIL of Lystrosaurus, an animal that survived Permian-Triassic extinction event. At one point it represented 95% of all land vertebrates for millions of years. Among other suggestions, it has been proposed this dominance was a matter of sheer luck.
eRB4 TIL a US army Sgt. single-handedly held off 30+ men alternating between a M16 and sniper rifle, and when rescued, opted to stay behind to defend his immovable injured comrade
5VWLQ TIL that people in medieval times slept in two segments
J1vDj TIL that the famous painter Rembrandt created over a hundred self portraits during his life and you can look at them chronologically to see how he aged! He is one of the oldest people you can do this for.