It's commonly misunderstood saying. It uses an almost-obsolete meaning of the verb "prove" which means "test". (As in "proving grounds.") The exception tests the rule. 73, Carl WS7L > > --- On Sun, 4/5/09, Steve Ellington <n4lq at carolina.rr.com> wrote: > > > > The exception proves the rule. > > And what's that supposed to mean? > >