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TIL China used more cement between 2011 and 2013 than the US did in the entire 20th century

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AgXw TIL Bono was campaigning to have first-world taxpayers forgive all third world debt whilst hiding U2s earnings from Irish tax collectors in the Netherlands.
Mw8m TIL astronauts don’t float because they’ve escaped Earth’s gravity (they still experience 90% of Earth’s gravity), but because they are in free fall, constantly falling back to Earth
MeLL7 TIL that Iridium is so rare on Earth that annual worldwide production is only three tonnes
epaag TIL that Barry Manilow didn't write his huge 1977 hit "I Write the Songs". It was actually a cover of a song first recorded by The Captain and Tenille, written by Bruce Johnston of The Beach Boys.
rNNbo TIL during WW2, Germany experimented with rocket powered submarines. They could reach underwater speeds of 28.1 knots (52.0 km/h; 32.3 mph).