History & Present State of "Action at a Distance" The concept of action at a distance is an interesting one. To begin with, it has to have a definition; I'll try: correlation between two systems without anything noticeable in spacetime going from one system to the other (like photons, curvature, ...). I welcome better definitions, but let's not make the definition the core debate; I think we all know what is meant. It is interesting to see how belief and disbelief in this principle has varried throughout history. A short summary of what I can think of: Pro: Greek myth, gods with their power Anti: Democritus, everything is atoms Pro: Newton, gravity, instantaneous, no medium Anti: Einstein, gravity, curvature, not instantaneous Can anybody add to this? And I was wondering, what is the present state of this principle? Quantum entanglement seems to be an example of action at a distance? Is the majority of theories against it, or the other way around? Thanks.