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How to tell the difference between nerds and geeks 
Understand the origins of the geek. 
In order to fully appreciate the modern geek, one must find the roots of geekdom. 
Back in the early 1900s, when traveling carnivals were popular, there was a performer called the " geek.
" his job was to perform bizarre and disgusting acts for the amusement of the locals. Notably, this included biting the heads off live chickens.