who is the most powerful man in the world?

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Who is the most powerful man in the world? it is very difficult to answer this question. i think anybody can be the most powerful man, but since he can control his own mind. so i wish to say that a person who can really control his own mind can be the most powerful man in the world. there are many exaples in the world for my statement. but is the most difficult thing in the life of human beings. so please try to control your mind if u want to be powerful.