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TIL - The "jungle gym" was invented to teach kids 4d thinking

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D1OkP TIL about Arthur John Priest, a "fireman" who survived the sinking of the Titanic...and FIVE OTHER disasters at sea before and after.
X0paR TIL that from 1959-67, the US had a quasi-secret military base in Greenland built in tunnels dug under the snow. Camp Century was a scientific research station on arctic bases, but was really a cover for a second strike nuclear launch site.
vPZ1K TIL that French composer and organist Jehan Alain joined the French Army in WWII, serving as a despatch rider. He was conducting reconnaissance by motorbike when he encountered German infantry. Refusing to surrender, he killed 16 enemies before being gunned down.
J1YRk TIL The hippocampus of food-storing birds increases in size by up to 30% for a short period each year, so they can remember where they hid their food.
OoV6Y TIL That the Dark Film Noir/Art Deco feel to 'Batman: The Animated Series' was due to the use of black paper with light colours for animation, instead of the industry standard of dark colours on white paper.