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TIL that, due to the presence of quinine, tonic water is fluorescent under ultraviolet light or even the sun (pics inside!)

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4Llb TIL Morocco was the first nation to recognize American independence from the British Empire. In honor of this fact, Thomas Jefferson held a Ramadan celebration at the White House when he became President.
J19Aj TIL, a company called “NutEx” made radioactive condoms in the 1940s
WkaLo TIL that wolves get 7 hours of sleep on average per day, while mice get 14.5.
KYMjB TIL that Lewis Stone, who played Mickey Rooney's kindly old father in the Andy Hardy films, died of a heart attack while chasing the neighborhood kids off his lawn.
gMeQb TIL of a brawl involving 50 congressmen on the US House floor in 1858. It ended when someone knocked off a man's wig and the man accidentally put it back on backwards, causing both sides to laugh and stop fighting.