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TIL that Sir Christopher Lee has made multiple heavy metal cover songs of classic Christmas carols

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J5pB TIL of Harvard Observatory astronomer Henrietta Swan Leavitt; given the boring job of examining the luminosity of stars in thousands of photos, she discovered how to measure the distance between the Earth and faraway galaxies. At the time, she was not allowed to operate Harvard’s telescope.
arpJ TIL Argentina and Chile are the only two countries you can “Dig to China” from.
ANkml TIL Richard M. Daley authorized the midnight bulldozing of Meigs Field, a small, downtown, lakefront airport in Chicago. This stranded 16 planes on the ground including several Fire Department helicopters. The FAA fined the city $33,000 for not giving 30 days notice ahead of an airport closure.
4Xv85 TIL that the Florida Everglades is the only environment on earth in which Alligators and Crocodiles coexist
epgY5 TIL The Bacterial Flagellum is a naturally occurring motor that spins up to 100,000 rpm with nearly 100% efficiency and can reverse its rotational direction in milliseconds