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What determines the size of our brain?

To some extent, brain size is determined by genetics. There is a much greater correlation in brain size, for instance, in studies of identical twins who share the same genetic makeup than there is for fraternal twins, who share about half of the same genes.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.