Article about the practice of trepanation, otherwise known as trepanning, trephination or trephining. Trepanation is drilling, or otherwise making, a hole in the head or, more accurately, through the skull bone. The article explains that trepanation has been carried out throughout history across many different cultures. It also talks about more modern examples of voluntary trepanation.
http://www.infobarrel.com/What_is_Trepanation
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