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TIL the U.S. freight rail network moves one-third of all U.S. exports and roughly 40% of long distance freight volume, competing directly with the trucking industry

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n8Vd TIL At birth, Halibut have an eye on each side of the head, and swim like a salmon. After six months, one eye migrates to the other side, making them look more like flounder. At the same time, the stationary-eyed side darkens to match the top side, while the other side remains white.
E1D17 TIL both Caller ID and call waiting were invented Dr Shirley Jackson; the first African-American woman to gain a PhD from MIT. Her breakthroughs in theoretical physics & telecommunications also allowed for portable fax, fibre optic cables, and solar cells.
ANDkl TIL "Deep Throat" & "Last Tango in Paris," two massively influential x-rated films of the early 70s, cost more to attend than other films - a historical example of the demand-based pricing that is being considered by theater chains and studios
BrG0r TIL chimpanzees actually do understand rhythm and have been seen clapping and stomping specifically to the beat of a song
xogD TIL Edward Mordake reportedly had an extra face on the back of his head, which could neither eat nor speak, although it could laugh and cry