The human brain -- that three-pound mass of gray and white matter between your ears -- is the most complex object in the universe.

It contains as many neurons as there are stars in the Milky Way galaxy, and we know as much (or as little) about how they function as we know about all those stars.  (mercola.com)

http://discovermagazine.com/2007/aug/unsolved-brain-mysteries/article_view?b_start:int=0&-C=