Approaching Youngs to Unified Theories: The Charm of String Theories

In this paper a pedagogical introduction to some key concepts of the process of unification in modern physics is presented. Starting by the notions of space and time, so important in the history of the human thought and at philosophical level, the paper comes to the peculiar aspects of the current string theories, with indications for the teaching of this charming topics by primary school. Interesting considerations, emerging by the fascinating connections of these theories with topics such as the extra-dimensions, will be also done.