"will there ever be a day when people will know everything about the brain?" - yes..

the reason this is true is a self-inclusive truth. as people learn more and more about the mind, they'll be able to interact with those newly opened up areas, allowing them to justify those areas with better and better detail. in the end, people will not only know everything, but the point where they'll be at (understanding themselves) will produce a text that's so accurate and correspondive, it will only be able to be written and read in a single way.

the brain's a machine, just like any other. people sometimes say that we'll never understand it, and to that i'd just say that it's their way of saying they don't have the capacity to understand it, combined with a feeling of insecurity their proud mind feels when faced with a superior situation.  the more you know, the less you understand. i can see how easy it would be to say it's just not within human comprehension to understand the mind, especially since so many of us just don't have tha capacity for it or are spun off in the wrong direction. i can only hope i at least push the frontier forward, just a little bit, in hopes to reach that day.

compare it to a guy who doesn't know much about cars. one day, he hears a strange noise coming from some part of the car while driving. how can he fix this situation? well, in today's world, he'd probably just take it to a mechanic. but here's where the analogy differs - with the mind, there aren't really any true specialists, since we didn't design and build the mind, so we don't know exactly where its parts come from and where its makeup stems from.  at this point in time we just have our human sense of curiosity that drives us closer and closer to knowing.  i strive to isolate a different peice at a time based on the situations i'm put in during the course of my life, observing my mind and seeing to the best of my skill what's going on. as i learn new tactics, i descend to a new level where these learned skills serve as supplements to finding the next level.  The same would be true for the guy, if he decided he was going to try to fix the car on his own.  He would start by trial and error, isolating what kind of a sound it is, and seeing where in the car it comes from.  Then, run experiments that purposely try to alter what the sound is - running at different speeds, under different conditions, etc.  All of these should affect the source sound in a different way.  As his quest to find what this sound is grows deeper and deeper, along the way he'll pick up new information about things he didn't necessarily need to know but is thankful for the information now anyways - things like what the car is constructed of, how much the car weighs, etc.  In the end, assuming he does get to the root of the problem, he'll have to isolate all factors of the car in order to know the exact problem and know he's not making a misjudgement. he'll now know everything from the ground up about the car, and how everything has only one true explanation for why it's there.  In other words, he'll be put into the eyes of the makers of the car.  from this point, i could only imagine it would be an incredible experience - knowing when and where everything works, and most importantly, knowing how to enhance the car without having to worry about anything backfiring on him.

the key, however, is finding a source or heart of the car - what i call a kernel, derived from the UNIX term for the heart of operative instructions. once the source for the design is figured out, everything will seem to fit into place. with a car, its heart lies in the engine. therefore, once the guy realizdes that all the parts are there to keep the engine in working order, he can put better reference into why subordinate things are there, what he can take out, and what he can improve on.