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TIL the gauge of a shotgun is multiplicative inverse of the weight (in pounds) of the largest lead sphere that would fit in the barrel.

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XELwj TIL Of the metronome of Leningrad. During the Nazi siege of the city they installed 1,500 loudspeakers that constantly played the sound of a metronome. A slow rhythm meant safety and a fast rhythm warned of an air attack.
d8MNr TIL That 1 gram of activated charcoal has approximately 1,000 square meters of surface area.
8e5R4 TIL that Elvis had an identical twin brother, who was stillborn. Though he never knew his brother, this tragedy weighed on Elvis his whole life. His Mother always told him he was "Living for two"
kJp45 TIL In March 12, 1961, a character named Dennis the Menace debuted in the British comic “The Beano", a few hours later, an unrelated newspaper comic was released in the USA, with the character also being called Dennis the Menace.
KY8Qw TIL that the shortest verse in the Bible is "Jesus wept" (John 11:35).