Abstract In On Certainty , Wittgenstein conceives a novel way of dispelling skeptical doubts about our knowledge the external world. He acknowledges that in his attempt to refute skeptic, Moore uncovered epistemologically relevant propositions such as ‘I know this is hand’. But he denies appealing truisms likely succeed refuting skepticism–not because they cannot be doubted, but are not objects...

Migration is the permanent movement of some people called migrant, from one place to another for some reasons and values. Their migration is determined by some values and goals that lead to changes in migrants’ interaction system. In human history the shape of migration was changed due to social and environmental changes. From the eve of 19 century migration became important social phenom...