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TIL of Joseph Bazalgette, a civil engineer who built an extensive sewer network in London which was instrumental in curbing cholera, typhus and typhoid epidemics. Later he started cleansing Thames.

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NXm7E TIL cats' purring frequency (around 25-150 Hz) has been scientifically shown to be self-healing for them, including aiding in bone healing, and reducing stress.
rNM4x TIL that Robert De Niro originally auditioned for the role of Sonny in The Godfather, but lost the part to James Caan. De Niro later went on to win an Oscar for playing young Vito Corleone in The Godfather Part II.
awOpy TIL electrum is a naturally occurring alloy of gold and silver. It was used as early as the third millennium BCE in Egypt, as an exterior coating to the pyramidions atop pyramids and obelisks. The first metal coins ever made were of electrum and for a few decades, the Nobel Prize medals were too.
VO4p TIL that the idea for the South Park episode “Bebe’s Boobs Destroy Society” came from a party Trey attended where he witnessed two drunk friends grunting like gorillas over a woman.
P1kOe TIL the first Ciabatta bread was made in 1982