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TIL printers embed tracking codes as hidden yellow dots on pages, revealing who printed what and when

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l7vY7 TIL Germans and Americans fought side by side during WWII.
6EyZY TIL the founder of Barbie named the dolls after her kids, Barbara and Kenneth. Therefore, the real Barbie and Ken are actually brother and sister.
9BE7 TIL The Iron Maiden, a medieval torture device, never actually existed for that purpose. It was created by a museum curator when he added spikes to a female form sarcophagus.
j6nev TIL that Blue Monday was only written so that New Order could have an encore that played itself.
DBJY TIL A new survey of nearly 20,000 people who married between 2005 and 2012 finds that Cupid’s arrow flies as true for online daters as it does for partners who meet through more traditional venues.