Mahmoud said suddenly, "Skipper, there's strong evidence to support Jubal's conclusion.  You can analyse a culture from its language, every time - and there isn't any Martian word for 'war.'" He stopped and looked puzzled. "At least, I don't think there is.  Nor any word for 'weapon' nor for 'fighting.' If a word for a concept isn't in a language, then its culture simply doesn't have the referent the missing word would symbolize."