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Flashbacks do occur, but very rarely.

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rekd TIL The restoration of the Sistine Chapel’s ceiling was actually botched. They mistakenly removed carbon black on the ceiling which was assumed to be pollution but was actually used as tint - making the restored frescoes far brighter than they should be.
ep0an TIL: Concrete is the second-most-used substance on earth after water.
pY65N TIL CHEP started as an Australian Government initiative to reuse left over US Army pallets from WW2
epdgb TIL New Mexico has an official state cowboy song; "Under New Mexico Skies"
d8YRr TIL The Philippines is the most Pro-American country in the world with 85-94% of Filipinos viewing Americans and the US favorably