Some take-away lessons from On Intelligence by Jeff Hawkins...
The book concentrates on the neocortext (aka the cortex), a cauliflower-like sheet of tissue on the outer surface of the brain. "Almost everything we think of as intelligence perception, language, mathematics, art, music, and planning occurs here. your neocortex is reading this weblog entry.
The average human neocortex, spread out, would be about the size of an unfolded dinner napkin, built of 6 layers, in total about the thickness of a 6 business cards. Anatomists estimate the typical human neocortex to contain around 30 billion neurons (perhaps less, perhaps more). These cells contain all of your memories, knowledge, skills, and life experience. They are "you".
The hippocampus is the "uppermost" level of the neocortex. That's pretty neat. The hippocampus creates longterm memories (which are then stored in the neocortext).