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TIL that Alison Arngrim's (Nellie Oleson in Little House on the Prairie) mother is Norma Mcmillan, the original voice of Casper The Friendly Ghost.

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8adk8 TIL that the 9/11 Memorial's brass panels - on which victims' names are inscribed - have their own heating and cooling systems so that they are never too hot or cold to touch
wnnM TIL that during the outbreak of World War II, London Zoo killed all their venomous animals in case the zoo was bombed and the animals escaped
a8Ego TIL that the Apple stocks icon represents the point where Apple's share value overtook Dell's
R7bj9 TIL, the quietest room in the world measures at -9 dB, and will drive you mad. One reporter lasted up to 45 minutes, and most people leave after half that time, tortured by the eerie sounds of their own body.
WkJPX TIL about Toxorhynchites, a type of large mosquito that doesn't drink blood and kills the larvae of the kinds that do.