Would you believe it folks if I say that one minute mutation which weakened strength of our mandible muscles (jaw muscles) reducing capability to chewing / biting harder things made us intelligent !
That is because we wore no longer able to eat meat directly from dead animals. As our jaw muscles become weaker we had to develop tools to cut dead animals and this is how our brain started to develop and in times we started making more tools and pass on the information to our next generations .. !
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