ChristianKl comments on Open Thread, Jun. 15 - Jun. 21, 2015 - Less Wrong
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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.