So, If you adopt a child,.. it will have the limit of whatever inate intelligence it was born with? OR,.. Said child can become more intelligent because of the nurturing, care, and education it recieves (Therefore stimulating those parts of the brain)? Hard question. You could take Identical twins (or clones, lol) put them into diverse situations, The child that recieves more stimulation and imput will develope more nueron connections, more usable parts of the brain. Hmmmmmm, very interesting.