The theory of energy recovery is a comprehensive physical theory to a large extent, which derive major theories of physics such as Newton's principles and special and general relativity and quantum theory and Bohr's hypotheses to determine diameters atoms and the theory of mechanics waveform of Louis de Broglie.... The discovery of this theory because of my research on ways to facilitate the understanding of physics for students, being a teacher of this substance, where I noticed alienated by the students for this substance, This research led to the discovery of this theory, which has become today of easy for students to derive and understand any theory of physics from the previous theories, In addition to the discovery of other theories th...