So it seems some of these efforts suggest that spin networks, or the quantum foam, produce both virtual particles and even spacetime itself. Perhaps we can explore what the overall implication of this would be. I have a few questions along these lines that might be worth considering. 1) Would it be more correct to say that the spin network/ quantum foam produce both virtual particles and spacetime itself? Or would it be more correct to say that that the virtual particles of the quantum foam can be reinterpreted as spacetime - I think this is what J.C. Baez' work seems to suggest. 2) In either case, what does it mean to have a "vacuum energy" or zero point energy of a QFT or TQFT that produce both virtual particles and spacetime? Would there be only one value for any kind of spacetime and particle content? Or could we be facing a "Landscape" of vacuum energies even in these theories? 3) What does it mean that such a "vacuum" energy of the quantum foam may also produce spacetime? Does this mean quantum bits of spacetime also pop into and out of existence like virtual particles? If at each point in space, quantum space bits may also come into existence, is this responsible for the expansion of space and the Hubble law of cosmology? 4) Might a particular value of vacuum energy mean that whatever particles or virtual particles are not produced by the quantum foam must be compensated by quantum spacetime bits? If there is more quantum spacetime bits being produced more at one point than another, does that give rise to the curvature of spacetime? Might this also possibly explain the speed of light where in the FOR of the moving particle, quantum spacetime bits are changing more than at rest, etc? 5) Could there be some sort of entropy constraint that requires virtual spacetime and virtual particles to balance each other? Perhaps considerations of this nature could rule out some theories in favor of another, for example, whether spacetime is an alternate interpretation of virtual particles or whether the quantum foam must produce both spacetime and particles?