Okay. The way your other post was worded it seemed to be agreeing with the article, thanks for clarifying what you meant.

What the article is saying is that there is no evidence that we only use a small portion of our brains, but that what we have observed supports the theory that we use many areas of the brain. No one knows the percentage, but we do know that the brain is too complex to put in a neat little box which asserts that we use almost none of it.

Their main point is that the 10% or 20% people hear all the time is not an established fact at all. Their second point is that evolution cannot account for what we have observed the brain do in terms of adapting to things like loss of sight in old age, since it has no evolutionary advantage.

Don't know if that helps, but then the subject isn't exactly elementary, so don't feel bad ;-)