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TIL of Joy Milne who claimed that she smelled a distinct odor in patients with Parkinson's disease like her husband. She sniffed 6 shirts from people with Parkinson’s and 6 from healthy controls and identified 7 had it. 8 months later the "healthy" patient she "misidentified" was diagnosed as well.

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via reddit.com

WkL5Y TIL that in the 1936 Olympic games, boxer Thomas Hamilton-Brown lost his opening bout so went on an eating binge to console himself. An error was soon discovered and it turned out he didn't lose, but was disqualified from competition because he had gained so much weight from binge eating.
kJaad TIL about Project Azorian: The C.I.A.'s secret submarine retrieval mission. After a Russian submarine crashed a millionaire helped them secretly build a ship with a giant claw game on the bottom of it, complete with over three miles of pipe to lower the claw.
Z81bQ TIL that in 1948, the United Nations created the Universal Declaration of Human Rights, which outlines basic rights and freedoms universal to all humans. It has since become foundational in international law and is the most translated document, with copies available in 524 languages
YpG5Z TIL After courting the female seahorse and securing her eggs, the male seahorse carries the babies through pregnancy and delivery.
7Dpb TIL American Geochemist Clair Patterson helped reduce lead levels within the blood of Americans by approximately 80% by the late 90s, after spending decades of fighting the industrial use of lead.