Yeah, I should create a course for the Khans Academy, to summarize 2 decades of research, but my English is too weak for that. So, kinetic energy is stored as

Yeah, I should create a course for the Khans Academy, to summarize 2 decades of research, but my English is too weak for that. So, kinetic energy is stored as potential energy, and then released as kinetic energy again? Yes, it's true, but the question is: what stores this energy and in which form? For example, when we use two electric magnets, when EM are attracted, energy for that is provided by grid, and when they are pulled apart, energy is returned back to grid. In case of gravitation, the "grid" is unknown yet, but we can try to find it by tracking the energy.