It must be recognized first of all that there are strong, advanced and dominant civilizations , dying or retreating civilizations at the end of the line which have no effect on events, and there are civilizations which vanish from existence and die. There is no more serious indication of this than the criterion of the disappearance of human languages. Throughout the whole span of human history there have been about ten thousand spoken languages spoken languages. Today the number is about six thousand languages which are used, but many of them are not used frequently and taught to children

It must be recognized first of all that there are strong, advanced and dominant civilizations , dying or retreating civilizations at the end of the line which have no effect on events, and there are civilizations which vanish from existence and die. There is no more serious indication of this than the criterion of the disappearance of human languages. Throughout the whole span of human history there have been about ten thousand spoken languages spoken languages. Today the number is about six thousand languages which are used, but many of them are not used frequently and taught to children