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TIL that a solid 8 hour sleep is actually unnatural to us as a species. A 4 hour sleep, waking for 1-2 hours, followed by another 4 hour sleep is how we slept for the majority of evolution. The change to a solid 8 hour sleep was originally attributed to improvements in lighting and other things.

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wJwE TIL a US Navy POW blinked the word ‘torture’ in morse code during a forced TV interview in North Vietnam to signal his conditions to the Office of Naval Intelligence
oNjo TIL Bob Dylan twice tried to sneak into tapings of American Idol with a fake beard, but was recognized both times by Paula Abdul.
OolpY TIL in September 1939, at the onset of World War II. The Night Watch was detached from its frame and rolled around a cylinder. The rolled painting was stored for four years in a special safe that was built to protect many works of art in the caves of Maastricht, Netherlands.
5YGKB TIL Ivy league schools all had ties to the Opium trade in the late 19th century with major benefactors using their drug money to fund libraries, societies and even Princeton itself. Undergrads even began running opium dens from Boston to New York until a Harvard student OD'd in 1889.
8Xk4 TIL that after Virginia legalized concealed carry in bars in 2010, they saw a 5.2% decrease in violent crime around bars.