I am no cognitive scientist, but I believe some of my "thinking" takes place outside of brain (elsewhere in my body) and I am almost certain some of it takes place on my paper and computer.

Voted up and seconded. Yvain, If what you actually mean is "operate solely through physical means contained within the human body or physical means manipulated by interaction with the human body," then I'll up it to whatever number is supposed to be used for, "I'm only leaving room for uncertainty because there's no such thing as certainty." ;-)