This thing about vacuum having something comes from the modern physicist's misuse of the heisengberg principle. The virtual photon is a theorized particle that was used to explain the static effect of the electric field, because honestly there was nothing better to explain such a phenomenon. Just like when they came up with the higgs boson to explain the weak interaction, even though we are coming closer to realize that it probably doesn't exist. Does anyone beg to infer that the microwaves could of come from the energy of the vibrating mirrors themselves? This is starting to sound a lot like the hyped up cold-fusion experimental results, or the whole combustible salt-water phenomenon.