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TIL more than six billion different knot types have been identified by mathematicians and scientists since the 1800s.

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Y777d TIL that the United States Postal Service will allow you to ship bees and scorpions, but not dogs or cats
5YAon TIL the Israeli intelligence agency (MOSSAD) ran a high end diving resort in Sudan for years as a cover to smuggling Jewish Ethiopians back to Israel.
MZJW TIL that during a critical moment in the Apollo 13 mission the Soviet Union discontinued radio transmissions in the frequency bands used by Apollo to prevent radio interference
17aO TIL Neslte paid doctors and nurses in developing countries in the 1970’s to promote their baby formula over breast-feeding, leading to the deaths of thousands of infants.
rNme TIL a much higher percentage of astronauts wear corrective glasses in space, while fewer wear them on earth. The lack of gravity affects the shape of the eye.