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TIL that construction of the Washington Monument was paused for twenty years between 1859 and 1879. The bottom third of the monument is slightly lighter than the rest because marble from different quarries was used after construction resumed.

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1KNP TIL 3 of the 4 sunk US battleships at the Attack on Pearl Harbor were later raised, returned to service, and used to fight in World War II
b6jxj TIL in 1974 the British Army occupied Heathrow Airport without the knowledge of the Prime Minister Harold Wilson. The Army claimed it was anti-terror training but many believed it was part of a secret plot named 'Clockwork Orange'.
gMYQ7 TIL Mosquitoes love type O blood for no good reason. -- protect yourself with a goid insect repellent!
R7oN1 TIL of the existence of "scholarly publishing stings", in which academics submit absurd research papers to scholarly journals to test if the editors are actually paying attention. Sometimes, these are accepted and published.
x6jA5 TIL: Breakfast Cereal Was Invented in Michigan