I Keep My Extras In My Posterior

I was watching TLC's "Urban Legends" Show and one of the questions they asked was "Do Humans only use 10% of our brains?" Of course I had heard that, and even had read it in Sci-Fi books as a basis for some people being able to use "more" of their brain capacity and thus gaining powers like Telepathy, Telekinesis, and other 'Mind Powers'.

As this article and others state, we pretty much use 100% of our brains.

I guess I can quit trying to exercise mine. Here I thought I could turn the 90% 'fat' into some mental muscle.