brains

http://news.independent.co.uk/uk/health_medical/article2081652.ece

Most people - here, at least - believe that mental experiences (thoughts; feelings; sensations; etc.) are [by-products of] brain processes. I.e., they believe that the brain really exists. But how do we reconcile the 'motion of bricks', as it were (that's what it boils down to if we believe that...

(CNN) -- It's an argument that's as old as it is contentious: that male and female brains work differently. It's also spawned countless self-help books (think "Men Are From Mars, Women Are From Venus") and bland jokes about women being unable to read maps, or men never asking for directions...

The difference between male and female brains. :p

http://www.theage.com.au/articles/2003/08/08/1060145869888.html According to this article, for most of us, not. Some of us do use more than others. A look at the brain activity of a gifted mathematician shows he has more parts of his brain active when solving a puzzle than the average person.