7) Let There Be Atoms!
As Atoms began to assemble from the the photon-matter plasma, light found itself free for the first time. No longer trapped in short-sighted interactions with Electrons, it could fulfil its potential and travel along the vast open distances that now existed between atoms. The fog cleared. For the first time, the universe was transparent.
So the photons sped out in wiggly-straight lines at the highest speeds in the universe. It is quite hard to believe, but despite their mind-bending quickness, some of those old, first freed photons which raced through the first unobstructed space are still travelling today. In all those billions of years, there are some which have not collided with even a dust-particle of matter. Stranger still, the chances are that you will have heard them playing their exodus song on a crackly old radio set.
When tuning between stations, you will hear a fizzing sound made up of lots of different frequencies, which is called white noise. This can come from many sources, but a portion of the static that you hear is in fact several billion years old. It has travelled the length of the universe. It is the sound of a select few of those original photons arriving in your living room.