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TIL of the "Green Book" which was a travel guide for black people published up until 1966 that gave locations on safe stops and routes for travel in the U.S.

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aK0N TIL: A NOOK is a small corner formed by two walls; an alcove or recess, forming a hidden or secluded spot. A CRANNY, by comparison, is small, narrow opening, fissure, or crevice in a wall, or other substance.
VBLaB TIL The safety pin was invented in 1849 to settle a $15 debt.
EgxOW TIL that the list of big banks in 1988 is dominated by Japanese institutions, which captured the first 10 spots and 17 of the top 25.
rRwwd TIL that in the 1700s, Queen Caroline of Great Britain had smallpox innoculation trialled on six prisoners in return for commuting their death sentences. When this was successful, she innoculated her own children, popularising the process.
KYDP6 TIL Rosalynn Carter sat in on Jimmy Carter's presidential Cabinet meetings and took notes so she would always know what was going on, and also was the first First Lady to have her own office in the East Wing.