The size of brain is the same, but smarter people tend to be able to use more of their brains. I don’t think they would look different but maybe if you measured brain activity a smarter individuals activity would be different.
It also depends on what you class as clever- someone who is academically not very clever but very street smart might have to use more of their brain to function so may be “cleverer”. Good question!
They will look the same. It depends on what you mean by smart, as there are different types of intellegence. In any case you would have an increased amount of connections between the neuones(the brain cells) in a smarter individual. some areas may vary in size, e.g. someone who had to adapt to speaking more would have larger speech centres in the brain.
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