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TIL of the Circumhorizon Arc, aka fire rainbow. This horizontal "rainbow" of colour occurs when the sun or moon is over 50 degrees above the horizon and an arc of light passes thru a very specific kind of cloud (Cirrus clouds made up of ice crystals parallel to the ground), at just the right angle.

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kJY7m TIL after being sent to Baltimore in his youth, Frederick Douglass learned the alphabet from the mistress of the house he moved into. When the mistress' husband put an end to the lessons, Douglass began trading bread to hungry neighborhood children who, in turn, helped him learn how to read & write
nWDPr TIL There is a temple in India known as the Temple of Rats(Karni Mata Temple) where approximately 20,000 Rats(kābā) reside which are considered holy and treated with utmost care by devotees. Temple rules state that if you kill a Rat, you must replace it with a rat made of solid silver or gold.
gMnKD TIL the meteor that wiped out the dinosaurs created a line of freshwater caves. The Mayan culture was able to rise in the normally freshwater-poor Yucatan directly as a result of that meteor.
kO7Q5 TIL lewis Carrol developed ideas in linear algebra, probability & the study of elections & committees. Also one of his inventions was a writing tablet called the nyctograph that allowed note-taking in the dark, thus eliminating the need to get out of bed and strike a light when one woke with an idea
oBjvY TIL the lyrics of "Paperback Writer" actually show a bad pitch of a book - reasons for the pitch's low quality include not telling enough about the plot, revealing the writer's desperation, making outlandish claims and showing that the book is unfinished.