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TIL - The first push-button telephone was commercially introduced by Bell Telephone on November 18, 1963. Prior to this phones operated on a rotary system.

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nZ6Y TIL that dolphins, like humans cannot drink seawater and the only source of liquid they consume is from the food they eat.
OAN4 TIL that the English word “black” has the same origins as the French “blanc” and Spanish “blanco” meaning white.
x6my5 TIL that in medieval Europe, animals were put on trial for crimes
ZvDo TIL Conrad Heyer, born in 1749, is this earliest-born person ever to be photographed
dDWWd TIL that the mayor of New York City wanted to secede from the Union at the outbreak of the Civil War