Abstract

No serious dynamic theory in physics can do without interactions, the trademark of event relativities as contrasted to kinematic mod-els. While fundamental force laws (Newton, Coulomb) have been successfully formulated in terms of simple one-body potentials, dy-namics calls for the more elaborate time-dependent potentials as pioneered by Weber for the case of two charges in relative motion. Local dynamic environments, changing incessantly in Nature?s real scenarios, are conveniently rendered in terms of generalized po-tentials which provide the relevant information on forces acting under changing conditions in agreement with Newton?s Action-Reaction Principle. Improper treatment or total neglect of potential energy in ?special relativity? and Copenhagen quantum theory discloses the weakness of these observer-centered theories. Important concepts (e.g. an upper speed limit, action, wave propagation, energy - a late arrival in physics, etc.) require absolute space, universal time, and a proper dynamic system of reference. The infinite and eternal Universe with its ubiquitous background potential defines the one-and-only legitimate dynamic inertial system where all of Nature?s laws hold without any of the severe restrictions artificially imposed by gedanken experiments and mathematical constructs.