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In November 1915, just hundred years ago, the whole world was shaken by a new visionary work. One man alone brought to humankind a profoundly different perspective on the very nature of, arguably, the most relevant aspects of our perceived reality: space and time.  In his "On the General Theory of Relativity" \cite{1915SPAW.......778E}, Albert Einsten discussed the intimate connection between space, time, energy and mass. The picture that emerges is extremely elegant.   %geometric theory in which the force of gravity emerges naturally as the stretching and bending of space-time caused by the presence of %mass and/or energy. The pinnacle of the theory is equation~\ref{einstein}, actually a set of 10 equations called {\bf Einstein's Field Equations}.   These equations describe gravitation as a result of space-time being curved by matter and energy.