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TIL the Library of Congress has a letter sent by a young Neil deGrasse Tyson to Carl Sagan, thanking Sagan for his generosity when they met at Cornell, and telling of his future career plans in science

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via reddit.com

PYpDZ TIL that in the Vietnam War, the Americans fired 50,000 bullets for each enemy killed
Y7RKW TIL that Liechtenstein sued Czechia for their stolen lands and castles they had owned for almost 700 years before their real estates were confiscated in Czechoslovakia after World War II under the so-called “Beneš decrees”. Czechia declined their claim, because of ethnic reasons.
grdn4 TIL 'Shoulder Angels' date back to a non-canonical story from 150AD.
nMdB TIL the first animal to ask an existential question was from a parrot named Alex. He asked what color he was, and learned that it was “grey”. (pdf)
XEgnj TIL a helicopter taxi to Monaco can be cheaper than a normal road taxi.