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TIL that while marijuana is a Schedule 1 drug, cocaine is listed as a schedule 2 and therefore able to be used pharmaceutically.

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lo9Ka TIL the queen parrotfish sleeps inside of a protective mucus bubble secreted from its mouth, presumably for hiding its scent from predators at night. The mucus bubble may also serve as an early warning system in the event that a predator, like a moray eel, tries to attack the resting parrotfish.
4XPba TIL After Polio started spreading, swimming pools and movie theaters were closed every summer for forty years.
w7YP TIL that the Immigration and Nationality Act of 1952 allows the President to “suspend the entry of all aliens or any class of aliens” who “would be detrimental to the interests of the United States”
Z85Wv TIL the cap of the Washington Monument contains 100 ounces of pure aluminum. Aluminum was one of the rarest and most valuable metals in the world – more valuable than silver – when the building was constructed in the 1850s.
WGrL TIL when the Dutch discovered penguins for the first time in the 17th century, they literally called them “fat gooses”