What follows is my personal take on Existence. What you will read stems from my own personal experiences and what I have learned through reading the experiences of others. This includes many experiences from those involved in Science, and as such will heavily lean towards the currently-accepted scientific viewpoint of Existence.
This is strictly a theory of physical existence contained within this Universe. As such, I will not attempt to explain what existed "before" this Universe, "outside" this Universe, nor what actually caused this Universe to come into existence. My story will start with Time Zero - the first moment after Creation occurred. I will not attempt to explain such concepts as the "soul", as my argument asserts that Human consciousness is purely a product of physical processes (ie: brain produces consciousness). If there is an aspect to Humans which is not produced via physical processes...it must lie beyond the confines of this Universe, and hence will not be touched upon in this story.
In my first post, I will attempt to give a basic timeline of the major events which have occurred over the past ~15 billion years. I will attempt to provide a basic outline of the theory and concepts involved with each event (as I will describe it).
In later posts I may try to expand on some of the particular events, though I will certainly expand upon anything that someone requests! If you want to hear more, just ask 
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Trendal's Unified Theory of Existence
Timeline
The timeline begins approximately 15 billion years ago (give or take a couple billion...) with the moment after Creation. All dates are approximate, unless otherwise noted.
Time 0 - The Universe, including all matter and energy contained within, came into existence spontaneously at this moment. At the first moment after the Creation event, the Universe consisted of an incredibly small spherical space. This space contained all of the energy/matter that exists today, and was thus incredibly hot. The fabric of the Universe was in a state of rapid expansion.
T+ 0.0001 seconds - The Universe has now expanded, and thus cooled, enough for the raw energy it contained to begin "condensing" into the matter we are familiar with - protons and neutrons.
T+ 100 seconds - The Universe has cooled enough for atomic nuclei to form. Only three species of atoms were formed at this point: hydrogen, helium, and lithium (with a small amount of their isotopes). The Universe was still far too hot for these nuclei to capture any electrons, and so consisted of a very hot and dense plasma.
T+ 10,000 years - Though still too hot for neutral atoms to form, the Universe had now cooled enough to allow photons to move freely throughout space. Until this point, any photon emitted would quickly be caught by another electron and re-emitted. This mean that "space" itself was opaque to light! After 10,000 years the temperature was cool enough such that electrons did not interfere as much with the photon radiation. Space became the colour it is now - transparent.
T+ 500,000 years - The Universe has cooled enough such that electrons can be "captured" by atomic nuclei, forming neutral atoms of hydrogen, helium, and lithium. The Universe now consists of a nearly-uniform cloud of hydrogen, helium, and lithium gas.
T+ 1 billion years - During the previous half-billion years, the gas cloud that made up the Universe had begun to contract towards small points of higher density. These "nodes" would grow in size slowly at first, but as more gas compressed in their centers they had more gravitational force to collect even more gas. At around 1 billion years ATB the first stars formed. These stars were super-massive and this caused them to have relatively short lifetimes (for stars) as they burned their fuel at incredible rates. In the center of these stars, the hydrogen/helium/lithium gases were being fused together to form new species of atoms - nitrogen, oxygen, carbon and most of the other common elements. These stars ended their life quickly, after only a few million years, and did so with incredibly violent supernova explosions. These super-massive stars began to form the first galaxies.
T+ 10 billion years - The process of "nucleosynthesis" has been going on for nine billion years in the centers of stars. This has produced a large assortment of atoms, which existed in large nebula clouds. In the outer rim of an average spiral galaxy, one such cloud was condensing. At the center a large ball of gas formed - a protostar. Because this cloud was rich in metals and non-gas elements, small planetoids also began to condense in orbit around the protostar. The third planet out in this particular system happened to be in the "green zone" for this particular star - the orbital zone in which water can exist as a liquid. We call this planet Earth.
T+ 11 billion years - The Earth has cooled considerably in it's short lifespan, so that the outer layer has turned into a crust floating on the liquid, still very hot, interior. A vast quantity of water was raining down on the young planet, brought in from the numerous icy comets in the solar system. Somewhere on the planet, compounds dissolved in the water combined into a new compound with special properties. If this compound came into contact with other pieces of itself, it could "assemble" those pieces into an exact copy of itself. Life as we know it had begun.
T+ 14.5 billion years - Life has spread into every nook and cranny of the Earth. Wherever Life can exist, it does exist. Until this point, all Life on Earth has existed as extremely simple bacteria. At this point, just 500 million years ago, Life suddenly exploded into a vast array of new species - including complex organisms consisting of groups of cells.
T+ 15 billion years - The Evolution of Life has progressed, in fits and starts, towards ever increasing complexity. Different species had arisen and fallen as the dominant life-form during the last 500 million years. Just a few million years ago, a few members of an ape-like species experienced a rapid increase in intelligence. They used their intelligence to their benefit, and this use of intelligence promoted further increase in intelligence. They began to fashion and use small hand-tools, which promoted even more increase in intelligence.
Present - I sit here, an intelligent ape, able to contemplate the previous 15 billion years of history...and most importantly able to ask why?
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Once, men turned their thinking over to machines in the hope that this would set them free.
But that only permitted other men with machines to enslave them.
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