Human Brain Evolution Was a 'Special Event'

I would imagine that like most things, human brain size and function will turn out to be the result of a whole host of things. I imagine that diet, environmental stimulus such as moving into a new niche, the genetic equivalent of the old Xerox Machine problems where the machines simply kept cranking out copies of a gene which meant that those copies could be modified without losing the function of the original, all these likely played a part.

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Aslan is not a Tame Lion