**Authors:** Leonardo Rubino

The General Theory of Relativity (GTR) is an extension of the Special Theory of Relativity (or Restricted) (STR); it was necessary for Einstein to explain the Gravitation. In the opinion of the writer, GTR is for sure a beautiful physical-mathematical theory, mathematical more than physical, maybe the most beautiful, but it’s also true that it has somewhat weird concepts inside. I think that the GTR is the typical falsifiable Popper-like theory, like if it were an interpretative model which works to explain many phenomena, but that it’s not the real essence of the phenomena just explained. I can scientifically explain the motion of a tyre by that of a rolling cut out cardboard circle, but this would be just a model which then must fall, once we go a bit deeper in it. And then, provided that the geometric interpretation of the curvature is real, we should still explain why the matter causes it; ok, it causes that, but why? To see is not the same as to explain and justify. In the GTR, the gravity is just attractive and Einstein, in his Theory of Unified Fields (let’s sum up a bit, out of brevity) after having used the concept of curvature in the GTR to explain the gravitational pull, also used the concept of torsion to try to explain also the repulsive forces of the electricity. All this unfortunately without success, that is, his unitary field equations (maybe 33) couldn’t be proved in the real Universe. Therefore, Einstein work didn’t finish with the GTR; in fact, he died in 1955 in a bed in a Hospital, with paper and pen in his hands! I personally think the force of gravity is a macroscopic force which is made of microscopic and electric forces among particles, positive and negative, which make the Universe, and that can be considered as randomly spread.

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