Putting bigger brains down to our social nature is half-baked

New Scientist 

In the past two million years, humans have experienced a massive increase in brain size, one not seen in any other species. This rapid evolution gave us brains roughly triple the volume of those of our pre-human ancestors. But the intelligence we enjoy as a result would seem to be advantageous for all sorts of species, not just us. So why was ours the only line to go down this route? The social brain hypothesis was a popular answer.

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