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TIL the lowest sound ever recorded is 57 octaves below middle-C and is from a black hole in the Perseus Cluster.

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4X0GN Today I learned about the discovery of viruses (bacteriophages) that kill bacteria and how they were experimenting with them as a treatment before the discovery of penicillin.
R7W46 TIL a near-mint copy of Action Comics No.1 dating from 1938 (the first comic book to feature Superman) now sells for $3.2 million
E1LQW TIL about the League of Militant Atheists, an atheistic and antireligious organization of workers and intelligentsia that developed in Soviet Russia. The League aimed at exterminating religion in all its manifestations and forming an anti-religious scientific mindset among the workers.
M7MWK TIL of the Vai syllabary, a script used for writing the Vai language of Liberia. It is hypothesized to be based off the Cherokee script, used by the Indigenous Cherokee people in modern day South Eastern United States, and diffused from Cherokee migrants on the Liberian coast.
QJQyX TIL cars made in the 1950s often had a loud and resonant 'country horn', and a quieter, polite 'city horn'