"Robin Dunbar's number is 147.8, plur or minus a lot, and it is the size of the average human being's social network of friends, as predicted by the size of the average human brain...the size of the orbitomedial prefrontal cortex correlates well with the size of a person's circle of friends..."
How Many Friends Can Your Brain Hold?
by Matt Ridley
http://online.wsj.com/article/SB10001424052748704422204576130602460527550.html
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