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TIL: Ketchup was sold in the 1830s as medicine. In 1834, it was sold as a cure for an upset stomach by an Ohio physician named John Cook. It wasn’t popularized as a condiment until the late 19th century.

X0GZE TIL about Mare Moscovrae, a lunar mare meaning "Sea of Moscow". Such maria were named after mental states or words for water in that era, but despite this tradition, the IAU accepted the name. At the meeting, French astronomer Audouin Dollfus said "Moscow is, in fact, a state of mind".
Xkn8 TIL Metallica’s “Fuel” has gone unedited for 15 years in virtually all radio airplay and live televised performances (including SNL) despite the word “Fuck” being clearly audible.
QJDpa TIL of the Minneapolis Skyway System, a system of footbridges that connects shops, restaurants, and residential buildings over an area of 80 full city blocks. It allows residents to live, work, and shop without ever leaving the Skyway system.
rN51w TIL Queen Victoria’s grandson Waldemar had hemophilia. The German royal was treated well by the Nazis and received multiple blood transfusions. In 1945 when Germany fell, all medical resources were diverted to holocaust survivors. The Americans refused Waldemar a transfusion and he died at age 56.
6E6mW TIL of Jack Unterweger, an Austrian serial killer. After murdering an 18-year-old girl, he got a life sentence, but became an author and campaigned to get himself released after just 15 years. He then became a reporter, reporting on his own crimes as he proceeded to kill at least 9 more people.