i think what is most amazing to me that is humans have been around for however long, and we still don't understand how the brain operates completely. i mean we get neurons firing and all that, but a true understanding of why one person is capable of learning more or why one person is so much more creative or why one person thinks logically and others more conceptually...nothing.
in fact most of what we have learned about emotions, memory, etc, is through accidents (people destroying part of their brains and acted completely different than they did before.)
it seems most of you are focusing on what we can process/learn, but you have to remember that your brain controls every movement, every emotion, every thought, every breath, every heart beat, every keystroke...that is an awful lot when you truly sit and think about it.
again, i say even the most knowledge people in the world about the human brain have no idea how much of it we use since they can't even understand some of the functions of it (ie-dimensia-sp?- no one is really sure what causes it or how it happens...alzhiemer's-sp?-either and these are deteriorations of the brain).
argue all you want, there is no answer. sorry