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TIL a 143 ton 'fatberg' was found underneath London in 2017, shutting down a major sewer line. They are created from flushed animal fat, oils, wet wipes and diapers. They have become a major problem in many major cities.

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via reddit.com

jNZ7n TIL of Hermann Grassmann, an untrained Prussian mathematician who created linear algebra (the central tool of quantum mechanics) 65 years before it found it's use in QM. For most of his life he was considered a crackpot but received an honourary PhD shortly before he died.
ymBe TIL in 1719, prisoners in Paris were allowed to go free, under the condition that they marry prostitutes and go with them to Louisiana. The newly married couples were chained together and taken to the port of embarkation.
mPvp TIL: Since criminalization of buying sex in Sweden prostitution hasn’t decreased, violence against prostitutes has increased and Sweden now trails virtually all of Western Europe in harm prevention for prostitutes[pdf].
ZpwoG TIL Patient “Zero” was a misunderstanding of patient “O”
LkQK9 TIL: Near-perfect ellipsoid lenses have been found among viking artifacts. Hinting that the Vikings likely made telescopes 1000 years ago, 500 years before Galileo.