Course 3 on Lorentz-Four-Contractions, Session 5, Part 2

Since there will always be chemical instability in so long that there is a material universe, since the amount of entropy tends to increase and not diminish, then electrons at some part of the universe will always have the ability to release energy. What I mean is that there is no shortage of electrons releasing energy. Thus, in so long as there is a universe there will be physical light. An individual photon is also a source of particles whose specific existence is one of indistinguishable difference. The condition of a simple harmonic beam of light is altered when it is scattered. Light must be scattered in order for light to differentiate "hands on" with other phenomena. If beams of light didn't directly interact, then light wouldn't be able to codifferentiate with anything. If light didn't directly interact with anything, then it would have no effect. If this was true, then it would be as if light didn't exist. But that isn't so. So light's scattering is part and parcel with its existence.