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TIL that ancient Romans used human urine as a mouthwash: Due to its ammonia content, urine was used as an ancient form of teeth whitening and stain removal.

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via reddit.com

11JO TIL that a popular slang in French for having your period is “Les Anglais ont debarqué”, or, “The English have landed”.
QJ8N6 TIL that residents in Surabaya, Indonesia can pay for the bus with plastic waste instead of money. Paying with plastic will grant you with 2 hours of travel. The aim is to reduce plastic waste whilst getting more people to use public transport, thus lowering the number of cars on the road.
GYGNG TIL that sharks have 7 senses. They have the same 5 that we have plus two more. One is used to detect vibrations and the other is used to detect electric fields.????
d8DoZ TIL that in 1871 Clement Vallandigham, a lawyer and Ohio politician defending a man accused of murder, accidentally shot himself while demonstrating how the victim might have accidentally shot himself. His client was cleared.
MJOb TIL the Church of Scientology ran several smear campaigns against author Paulette Cooper, one of their critics, including Operation Freakout, the goal of which was to have her admitted to a mental institution. Another, Operation Dynamite, used Cooper’s fingerprints to send bomb threats to the Church