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TIL the rarest element on Earth is the halogen Astatine. It’s so rare that only 30 grams of it can be found at any point in time on Earth, and only 0.05 micrograms of it has been produced to date. Most of its properties are unknown and no one has ever seen it in its natural form.

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Bd1k TIL infants are born the ability to use logarithmic counting and if left unaltered never change to our system of 5 or 10 based integer method
NJle TIL that in the days after hurricane Katrina, doctors at Memorial Hospital NOLA, began to euthanize patients that were deemed too sick to save.
1aY97 TIL that in 1924, a tunnel network was discovered underneath Washington D.C. Speculation behind the network's origins included a Confederate hideout or a liquor depot for bootleggers; they were actually dug by the Smithsonian Institute's entomologist Harrison G. Dyar, who 'did it for exercise'.
9wvE6 TIL Yamaha has been one of the leading piano manufacturers since the 1950's. They began building engines for propellors and airplanes during World War II. After the war, Yamaha used the new technology to build their first motorcycle engine, thus introducing Yamaha Motors to Yamaha Music.
jNgNM TIL that over 500 operating room fires occur every year in the U.S.