Green's Theorem: prov. [TMRC] For any story, in any group of
people there will be at least one person who has not heard the
story. A refinement of the theorem states that there will be
_exactly_ one person (if there were more than one, it wouldn't be as
bad to re-tell the story). [The name of this theorem is a play on a
fundamental theorem in calculus. --ESR]