BRAIN

Watts of power used by the human brain when it's engaged in deep thought: 14; watts required to operate an IBM personal computer: 90. 

Charis Conn, Editor, What Counts: The Complete Harper's Index.

The brain is a wonderful organ.  It starts working the moment you get up in the morning, and does not stop until you get into the office.

Robert Frost

I not only use all the brains that I have, but all that I can borrow.

Woodrow Wilson