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TIL Because mountain lions usually wander the wilderness alone, scent scraping sometimes isn’t enough to locate each other for mating. A female mountain lion will ascend to a high elevation and call to a male by caterwauling, a loud blood-curdling screeching cry that can be heard up to 5 miles away.

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WkbYL TIL of Julius Lothar Meyer who was a German chemist. He was one of the pioneers in developing the first periodic table of chemical elements. Both Mendeleev and Meyer worked with Robert Bunsen. He never used his first given name, and was known throughout his life simply as Lothar Meyer.
wOKP TIL that Freddie Mercury is celebrated in Iran, a country where homosexuality is illegal, and that Queen’s “Bohemian Rhapsody” was the 1st rock song officially approved post-revolution since he calls for God in Arabic (“Bismillah! We will not let you go”) to help regain his soul from Shaitan.
5YDZp TIL about the Thibodaux Massacre, a racial attack mounted by white paramilitary groups in Thibodaux, Louisiana from November 22-25 1887. As many as 300 overall were killed, wounded or missing, making it one of the most violent labor disputes in U.S. history.
rReQd TIL about an Indian art called Shatavadhana, where a person has to remember and answer questions on a stage from 100 people simultaneously while dealing with distractions in a round robin manner. The tasks vary from making up a poem spontaneously to keeping a count of a bell ringing at random.
PY1Kn TIL that after the U.S. Army Chemical Corps exposed over 11,000 guinea pigs to the bacterium Brucella suis via air-dropped M33s, one Chemical Corps general remarked, "Now we know what to do if we ever go to war against guinea pigs"