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TIL: William Duer, a member of George Washington's inner circle was involved in the first American Insider Trading scandal. Using his knowledge of upcoming Treasury actions, he borrowed and took money from the treasury to leverage bond bets. The market then crashed and Hamilton had to rescue it.

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VMDwD TIL in 1950, an Austrian psychology researcher had his assistant wear a pair of goggles that turned the world upside-down. By the 10th day, everything looked "normal" to him to the point he could effortlessly walk through a crowded sidewalk and even ride a bicycle while wearing them.
grKmX TIL whales sometimes fart. The bubbles that whale flatulence generates are about the size of a watermelon. The unpleasant odor of whale farts has been described by observers as "a combination of herring breath and the funk of rotten salad." Seals are also known to have particularly noisy farts.
DQVmr TIL about hemochromatosis, a condition that makes you absorb excess iron in your blood. The main therapy method is to donate blood every 1-16 weeks.
xkj0 TIL In 1945, Japanese radar operators detected a small number of incoming US planes (which carried the nuclear bombs to be dropped on Hiroshima and Nagasaki), but decided not to intercept them as the small number of planes were not seen as a threat.
b0PN TIL that, at the embryonic stage of development, humans have two hearts. They eventually fuse into one but, theoretically, if they were kept separated they would develop into two functional hearts.