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TIL the first movie trailer dates back to 1913, for the movie The Pleasure Seekers

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9YN17 TIL from 1897-1953, the NYC Post Office moved some of its mail using an intricate system of underground pneumatic tubes that shot canisters at a speed of 35 mph. At its peak, the tube system carried close to 100,000 letters a day – about 30% of all the mail that was routed through the city.
QJ68X TIL about the rarest blood type. Named SARAS, only 2 families in the world have it and is officially recognised as an entirely new blood group.
Oo0ag TIL: In an average week, nursing facilities in the US administer antipsychotic drugs to over 179,000 people who do not have diagnoses for which the drugs are approved.
Ypk5B TIL that in 2016, Train released an album covering Led Zeppelin II in its entirety. NY Daily News called it "confusing and unnecessary".
wLl4W TIL During the Civil War the Union Army made a parody of the Confederate's de facto anthem "Dixie"