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TIL "The Very Hungry Caterpillar" was first published in Japan because U.S. printers could not afford the holes and irregular pages.

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4XJjg TIL that not all identical twins share a placenta (in humans). About 30% of identicals have separate placentas; conversely, 100% of fraternal twins have their own.
awAyJ TIL after complaints that their "footlong" sub was 11 inches long, Subway said, "With regards to the size of the bread and calling it a footlong, 'Subway Footlong' is a registered trademark as a descriptive name for the sub sold in Subway Restaurants and not intended to be a measurement of length."
woj5J TIL in 1963 the FBI investigated five teenagers from Portland who called their band "The Kingsman" and had recorded "Louie Louie" because J. Edgar Hoover believed the song was salacious and was corrupting the nation's youth.
b6okE TIL - The Hamilton Pulsar P1 was the first digital watch, launched in 1972 for $2100 (>$12,000 today). Later in the 70's digital watches were around $10, and in the 80's they were given away free in cereal boxes.
b64r9 TIL the buzzing sound heard from a refrigerator is not from the motor, but from the refrigerant rapidly changing from a liquid to a gas and back again.