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garabik comments on Open Thread, Jun. 15 - Jun. 21, 2015 - Less Wrong Discussion
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E.g. imagine a society where human brains evolved just a little bit differently and >90% of population are dyslectics. This very obviously wouldn't matter until about the time proto-writing changed into true writing, i.e. after urban development and proto-states. But then, such a civilization is trapped.
Being able to read would be a valuable advantage and after tens of thousands of years of evolution, more and more people could read.
There's actually some evidence humans have made some adaptions to be better at reading, but I can't find a source.