Comment Re:** CORRECTION ** (Score 1) 199
You definitely need a medium, but the nature of the medium is highly questionable. (You need something to keep all distances from being in the same place, and a sea of virtual particles counts as a medium.)
More precisely to the point, any manifold can be considered a medium to those things that are embedded within it, as it applies constraints to what they can do, defines their neighbors, etc. And moving is done WITHIN the manifold. Please note that this doesn't even need to have a consistent metric to be true, much less any resistance.
Perhaps you use the word differently, but I'm not aware of any formal definition. (Dictionaries don't count, as they are never precise enough when talking about physical phenomena.)