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TIL What Really Happens When You Dream?&Why Do We Dream?

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R8L1 TIL the CIA website has a Kids’ Zone where kids can play spy based games including an aerial analysis game.
R7Dk4 TIL United States currency paper is composed of 75 percent cotton and 25 percent linen. Making it not actually paper, but cloth.
n1br Hippos cannot swim. Their bodies are far too dense to float. Instead, they push off the bottom of the river or run along the riverbed.
e5rk TIL that during WWI, Harry Houdini threw himself into the war effort, selling war bonds and teaching American soldiers how to free themselves from German handcuffs.
b9oN0 TIL Ian McKellen rejected an offer to play Dumbledore after Richard Harris died because Harris disapproved of his acting, and McKellen had already played "the real wizard"