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This paper is based on several additional papers, by the author of this paper, and as such, summarizes a broad theoretical research work. These papers intended initially to investigate the nature and the characteristics of the Entity of the Electric Charge. The first two parts of this research, dealing with Electric Charge, Energy, and Space, were published in two papers: "Energy Analysis of a Null Electromagnetic Wave" 6 and "The Nature of Space and Dark Energy, Based on Electric and Magnetic Fields' Behavior in Space in the Energy Pairs Theory Framework" 7. The first paper, 6, concluded that the Electric Charge is a form of Energy, similarly to Mass being recognized as a form of Energy by Einstein's Special Relativity Theory. And since all the tangible and perceptible matter in the universe is composed of only two Entities: Mass and Electric Charge, then, the first paper, 6, concluded that all the tangible and perceptible matter in the universe is just a form of Energy. The Second paper, 7, provided a reasonable explanation to the mysterious Dark Energy and concluded that also Space might be a form (or facet) of Energy. A third paper, by the author of this paper, "A New Theory Expands Einstein's General Relativity Theory to Include Both Electric Charge and Mass Entities" 10 studied the origins of the Electrically Charged Bodies' Interactions. It provided an explanation to what causes the Attraction/Repulsion between Electric Charges, which is still a mystery, similarly to the explanation of Einstein's General Relativity Theory to what causes the Attraction between Massive Objects. As such, the third paper, 10, is an expansion of Einstein's General Relativity Theory to include in it not only Massive Objects but also Electric Charges. Additional papers, by the author of this paper, which are also referenced in the body of this paper, focus on details and additional elements of this research, and this paper, derives additional conclusions from all the previous papers mentioned above, with the most significant conclusion being that Nature, or the Existence, is composed of only one distinct and independent Entity: Energy. All other Entities used by Physics in order to understand or explain Nature, are actually redundant, and are necessary only to help Humans percept Nature, and, this paper concludes, that all these other Entities are either facets of Energy, or tools we use to explain how Energies convert from one form of Energy to another form of Energy, and how forms of Energies interact with each other.
Moshe Segal (Mon,) studied this question.