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TIL the chainsaw was invented to help during difficult childbirth; it would be used to cut away parts of the pelvis to make space for the baby.

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WN89 TIL that ‘Black Swan Theory’ is the idea that rare catastrophic events which are beyond the realm of normal expectation or predictability (but later inappropriately rationalized by hindsight) play a vastly larger role in the course of history than any predictable or foreseeable occurrence.
j8E TIL that since 2010, ps3 uses an audio watermark algorithm to detect illegal movie copies. It can survive compression, re-encoding and microphone recording yet it is imperceptible to human hearing.
oRR5r TIL that Disney doesn't own the copyright to their theme tune, "When You Wish Upon a Star" from 1940's Pinocchio. The rights to that song, as well as several other Disney songs, were sold in 1933 to a music publisher because Disney "had no means of commercially exploiting" them at the time.
4yV6 TIL: Elon Musk admitted that the Tesla Model E name — and the idea of spelling out S.E.X. — originally came from a friend who was joking with him about future Tesla names.
p8Q1p TIL The symbol "℞", sometimes transliterated as "Rx", is recorded in 16th century manuscripts as an abbreviation of the late Latin instruction recipe, meaning 'take thou'. Originally abbreviated Rc, the later convention of using a slash to indicate abbreviation resulted in the modern common symbol.