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TIL of the "Tumi" scalpel, believed to be the oldest surgical instrument to exist (8000 BC). It was used for trepanation, the art of drilling a hole into the skull. By opening the skull, tribes believed that it would allow the demons that caused headaches, melancholy or epilepsy to escape the body.

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YOxZ TIL David Tennant was almost cast as Dr.Hannibal Lecter in NBC ¨Hannibal¨, the last two candidate being him and Mads Mikkelsen.
VDbB TIL prescriptivism, which prescribes rigid grammatical rules to written English, only came into favour in the late 1800s. Prior to this most writers were comfortable using multiple spellings and grammatical conventions within a single text.
5VYBD TIL that, because of a certain time zone is more than 12 hours offset from UTC (Line Islands, Kiribati, UTC+14), it can simultaneously be three different days on Earth at the same time!
BXBD TIL Wil.I.Am created the Samurai Jack theme song
1aPgX TIL that long-beaked echidnas have four-headed penises and are known as monotremes, meaning egg laying mammals. This perhaps hints at early mammalian evolution from reptiles. These guys are sadly critically endangered owing to habitat loss!