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TIL that Mammoth Cave was used as the site of an experimental hospital to treat tuberculosis. 16 patients lived in darkness in buildings constructed underground. 5 patients died and the experiment was ended within 5 months.

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kOZZE TIL of the Karen people, an "ethnolinguistic group" of millions, living in Myanmar, Thailand, and other Asian countries. They speak diverse Karen languages and some have been at war with the Burmese government for nearly 70 years.
Wk5eN TIL in 1985, sportswriter Zotique Lespérance was inducted into the Hockey Hall of Fame's media section, along with Tim Moriarty and Dick Johnson, however Lespérance was not invited to his induction ceremony as the Hall of Fame was misinformed that he had died. Lespérance was invited the next year.
R5l9l TIL that the myth of carrots improving your eyesight and helping you see in the dark was WWII propaganda
mxmwy TIL flow is the mental state in which a person is completely absorbed in an activity, resulting in a loss of their sense of space and time.
OogPa TIL of Elizabeth Swaney, a completely average skier who managed to compete in the Olympics by cleverly manipulating the system