Hey,
Um as far as I know, everyone is blessed with equal amount of brains but it depends on the individual, whether they use 5% of it or 55%. I have heard that an average person only uses 25 % of their brains (at least I think thats the figure). Just imagine, what would you be able to do, if you could use 80% of it :)
Ciao
There is good data in the medical literature to suggest that intelligence (based on a few variables-problem solving, speed of solution, memory etc) has a strong dimentional property-ie genetic component is high. Also studies show that IQs (not a perfect measure of intelligence)tends to go towards the mean in children of parents. However since intelligence (the brain and its hardwiring contributing to it significantly)is a polygenic trait, involving many genes, concievably dumb parents can give birth to "intelligent" children. Other factors like environment, pre/perinatal nutrition and life history also play a role.
So if you are born a fool, dont despair, perhaps if you mate enough, you can have some einstiens. And if you are an einstien, dont beat you kid for not continuing your work on the theory of relativity.
Aside from intelligence how about success.
However success is a totally different topic....