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TIL that there was an outbreak of the plague in the US during the 20th Century

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NwpE TIL that due to changes in local gravity, a pendulum clock accurate at sea level will lose around 16 seconds per day if moved to an altitude of 4000 feet.
7e8O TIL that Vermont abolished slavery in 1777, while still an independent nation. This means Vermont was both the first state, and the first nation in the Americas to abolish the institution of slavery.
W7pod TIL Nicolas Cage once searched England and the United States looking for the Holy Grail.
kO0Mg TIL that haunted house attractions didn't really go mainstream in North America until the Great Depression, when parents began organizing haunted houses or trails to keep young men from causing trouble on All Hallow's Eve.
pY0Xb TIL in Phantom of the Opera (1925) there is a mysterious prologue with a man holding a lantern talking. No surviving dialogue or title cards exist, and historians are unsure of where this scene came from