In this paper a pedagogical, but rigorous introduction to the key concepts of relativity is presented. Starting by the notions of space and time, of fundamental importance for the evolution for the global knowledge of children already in the primary school, we arrive to indications about the teaching of relativity in high school and university. Interesting considerations related to fascinating topics, like the evolution of the concept of space-time and the unusual amazing peculiarities emerging by the extensions of relativity, will be done.

pedagogy, primary school, secondary school, university, space, time, relativity, knowledge, unified theories