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TIL that Father and Son (1970) by Cat Stevens was originally written as part of a musical about the Russian Revolution which got scrapped when Stevens contracted tuberculosis. It's a dialogue between a conservative farmer and his revolutionary son.

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Z87oB TIL cruise ships emissions can equal the equivalent of one million cars per day and air quality on deck can be worse than in the world’s most polluted cities.
R5arj TIL In the 4th century BC, Aristarchus of Samos proposed that the sun – not the earth – was the center of the universe. Copernicus proposed the same theory 1,800 later.
gMaL7 TIL That the US Flag Code does not require that a US flag that touches the ground be burned but merely to adjust the flag so that it is no longer touching the ground.
v6rx TIL During a “Botched Drug Raid” using a No-Knock Warrant 39 shots were fired at an elderly woman after she fired one shot over the heads of the plain clothed men entering her home. Those same officers later planted coke and marijuana at her home in a failed attempt at framing her.
RQE7 TIL that in the 1960’s, for fear of having their submarine communication cables cut by the Soviets, the US military sent 480,000,000 copper needles into space to secure their communications infrastructure. The needles acted as a mirror for radio waves, enabling communication between distant sites.