Sometimes we cannot think of the name of a person or the name of a place. We screw up our face, we ponder hard, and we try to recall it. Then someone suggests a name. We say "No, that's not it." How did we know it was wrong if we cannot say what's right? But then someone says the right name, and we immediately say "Hey, that's it!". If our brain knew all along what was right and what was wrong, why didn't it come into our consciousness when we were pondering? Do we have two brains, one which handles most thinking tasks but sometimes forgets and one which always knows the right answers but somehow cannot assert itself when we need it to? What's going on here?