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TIL most color laser printers sold today create an invisible code that records where and when a page was printed.

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R5MJ9 TIL in 1575, Don Quixote author Miguel de Cervantes and his brother Rodrigo were captured and enslaved by Barbary Pirates. After two years his family could only afford one ransom, so Rodrigo was freed. Cervantes was freed three years later after a religious charity paid his ransom.
KrWR TIL that from 2004 to 2011, American and American-trained Iraqi troops repeatedly encountered, and on at least six occasions were wounded by, chemical weapons remaining from years earlier in Saddam Hussein’s rule.
R7WnQ TIL Toronto's CN Tower has a "Skypod", one of the highest observation platforms in the world at 447m. It is 33 additional storeys higher than the LookOut Level and visibility is up to 160 km (100 miles) away to Niagara Falls and New York State
R7xj4 TIL "Dove" and "Pigeon" are names for the same bird. They're both names for members of the same family, Columbidae
Ypag7 TIL that the popular sleeping aid known as Ambien - zolpidem tartrate - was astonishingly discovered to bring back some minimally conscious patients back from a vegetative state.