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TIL that the height limit on Washington, DC buildings has been in place since 1910 and has nothing to do with the height of the Washington Monument or the Capital Dome. Instead, height limits are based on the width of each street.

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dD6rB TIL the UN & Survival International estimate that 100-200 uncontacted tribes (up to 10,000 individuals total) currently exist in the world. A majority of these live in South America with Brazil & National Geographic estimating that between 77-84 tribes reside in northern Brazil alone.
epdeg TIL that Michael Jackson organized a supergroup, in a similar fashion to 'We are the World', for the September 11th attacks, that was never released. The reasons "What More Can I Give" was shelved vary as to why, but could have been because of his then-campaign against Sony Music.
grZ8A TIL that Ritalin, a drug used to treat ADHD, is named after Margarita, the wife of the chemist who first synthesized the active ingredient Methylphenidate in 1944. She tried it herself and was pleased to find that it improved her performance when she played tennis.
b6Dw7 TIL that the word "shrapnel" comes from Lieutenant-General Henry Scrope Shrapnel, inventor of the first Shrapnel shell, whose name eventually came to be associated with the metal fragments his creation produced.
epApL TIL that Walt Disney refused to allow Alfred Hitchcock to film at Disneyland in the early 1960s because he had made "that disgusting movie Psycho."