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TIL that “moonbows” are a natural phenomenon that occurs when (1) the moon is close to full, (2) rain is falling opposite the moon, and (3) the moon is low. Since the moon is the only source of light, the lunar rainbow will appear monochromatic to the naked eye. (More links in comments)

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WkpkN TIL there's a grizzly bear nicknamed "The Boss" who's eaten two black bears, survived being hit by a train, weighs 300kg, but has never shown aggression towards humans despite spending a large amount of time near public places.
p8xNO TIL that some 15,000 Nigerian children were branded as witches and most ended up abandoned and living on the streets.
Z8BXv TIL about George Cassiday, the Man in the Green Hat. During Prohibition, Cassiday supplied alcohol to members of Congress, including those who voted for prohibition in the first place. After ten years, when the story broke, the public's outrage contributed the repeal of the 18th Amendment.
b66Np TIL about Draisines: pedal-powered rail-cycles. They are used for recreation on unused railway lines in Europe, South Korea & the USA. In the United States, tours have operated in several states nationwide: CA ME, OR & the Adirondack Mountains (NYS). They used to be used for railway maintenance.
D10PJ TIL that Robert Liston amputated a patient's leg so fast that he cut off his assistant's fingers and slashed through a spectator's coat. His patient and assistant died due to infection, and the spectator died due to shock, making this medical operation the only known one with a 300% mortality rate.