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> how hard was it to develop the genes that separate human intelligence from other primates?

Well, less than impossibly hard. Here's an interesting spin on this argument: http://diyhpl.us/~bryan/papers2/ai/How%20hard%20is%20artific...

On a related note: http://fennetic.net/irc/human_chimpanzee_brain_differences.p...

And also, this was an interesting exploration of the topic, with in utero electroporation of cortical matter to induce more brain growth: http://core.ac.uk/download/pdf/11034136.pdf

> Of course, human intelligence is hard to pin down -- for my personal definition

I suggest giving up on that question. Even if humans are not intelligent, there's at least one or a few properties of human brain matter that are causing all of these unexpected and unexplained results we observe from its operation.



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