From ancient civilizations to modern societies,the belief in the magic of numbers has persisted in spite of the advances in science and technology.there is nothing quite as stubborn as superstition.Even to day in the twenty-first cen tury,people still believe in bad luck and omens.In the future,people may work in space stations or travel the universe in starships,but there probably won't be a "starbase 13"or a rocket liftoff on friday the thirteenth.A seventh voyage will be a good one,and the third time around will still be lucky.