The tools of conquest do not necessarily come with bombs and explosions and fallout. There are weapons that are simply thoughts, attitudes, prejudices -- to be found in the minds of men. For the record, prejudices can kill and suspicion can destroy, and a thoughtless, frightened search for a scapegoat has a fallout all its own -- for the children and the children yet unborn. And the pity of it is that these things cannot be confined to the Twilight Zone.