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TIL there's a protein in our cells called PARP-1 that is constantly repairing damaged DNA our cells. But it can't repair the DNA in neurons (including brains) while we're awake. So it accumulates there until we fall asleep. Research now shows this accumulation of PARP-1 is what makes us sleepy.

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gMZ98 TIL: In 1953 when Frank Olson a bacteriologist and CIA employee fell from the window of a NYC hotel room his death was ruled suicide. >2 decades later, his family was awarded a $750K settlement as his death was tied to a top-secret government experiment and some subjects were illegally tested upon.
Dolv TIL: IKEA uses a technique called ‘bulla bulla’ - a bunch of items are purposely jumbled in bins to create the impression of volume and, therefore, inexpensiveness
e09db TIL the British invented the word "soccer" 200 years ago, as slang for association football ("assoc."-er). It only lost popularity in the '80s, when the term became "too American"
x6Kbg Today I learned about Constantinople's fall and the gate that got left open
PY4RJ TIL that Shaq joined the Freemasons in 2011