Entropy and Consciousness
Video in question
The Most Misunderstood Concept in Physics by Veritasium (Youtube)
In this video, Veritasium mentions a statement about how at the heat death of the universe things will get so "boring" that it wont matter if time is going forwards or backwards, and I thought it was really neat because that is the same concept found in Isaac Asimov's "The Last Question" wherein people ask an ever-increasingly-intelligent supercomputer how to reverse entropy, and at the last time it is asked, it says it will process until it figures it out, and then after the heat death of the universe it learns it and BOOM the big bang and everything starts over.
Synopsis from Wikipedia
"Eventually AC discovers the answer—that the reversal of entropy is, in fact, possible—but has nobody to report it to, since the universe is already dead. It therefore decides to answer by demonstration. The story ends with AC's pronouncement:
And AC said: "LET THERE BE LIGHT!" And there was light—"
This is interesting to me because I thought of something similar, but different. When Veritasium said "it wont matter if time goes backwards" it hit me. The idea of entropy moving to what is most likely (high entropy) as a fundamental law of the universe implies that there is some chance that low entropy can occur. This is even spoken about in the video, as objects get larger, the chance of "cold transferring energy to hot" is increasingly unlikely. But, as a betting man, I would wager that at some point in 10^infinity years, there will come a point when a chain reaction SO UNLIKELY occurs that it will essentially big bang backwards, where entropy is ever decreasing, eventually leading the the original big bang. This is similar to the idea of the "big crunch", almost like a rubber band.
Explanation from Wikipedia
"The Big Crunch is a hypothetical scenario for the ultimate fate of the universe, in which the expansion of the universe eventually reverses and the universe recollapses, ultimately causing the cosmic scale factor to reach absolute zero, an event potentially followed by a reformation of the universe starting with another Big Bang."
This "reverse of entropy" will essentially look like time going backwards, until it restarts itself and we start over. Getting into metaphysics a little bit, there are some theories about how reincarnation can work with the concepts of science, and explain how a "consciousness" is beyond something that is measurable or quantifiable, as if it is somewhat the same idea of an afterlife—something that is only perceivable when it occurs by the conscious entity it occurs to. In that regard, the idea that the universe will occur multiple times (in this theory, a potentially infinite number of times), each occurrence of the universe will allow each conscious entity to inhabit a different existence while preserving the "consciousness" as a form of existence outside of entropy.
All of this goes back full circle with the idea of things going to their most likely state. The most likely state of something that exists is to continue to exist, because to exist in the first place requires some level of chance, and likelyhood is on the side of random chance. Therefore, the idea that something will always be is more likely than eventually, nothing will be.
And I find some level of comfort in that.