>By + and - I assume you mean matter and anti-matter, not
 >protons/positrons and electrons/anti-protons.  Actually, when matter and
 >anti-matter come in contact, a violent reaction occurs, and the
 >substances are converted directly into energy.  E=mc^2.  That's A LOT of
 >energy.  The dilithium crystal is the only substance that can control
 >this reaction and also not react with anti-matter.  The reaction is
 >stabilized and a very efficient means of propulsion is harnessed.
 >(Incidentally, some have speculated and have very tentative evidence
 >that the U.S. government already has developed M/AM propulsion.  For
 >more details, visit www.artbell.com).  I doubt that this could come
 >about (in the real world) any time soon, but I wouldn't be suprised if
 >it happened in, say, 300-400 years?
Well a M/AM propulsion system would be very easy to come by. Several 
theoretical engines have been proposed.
All of them happen to be reactionary engines, and not space-drives 
(non-Newtonian spacewarpers).
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