Re: What is time?
I think being aware of our inseparable connection with the universe and realizing the fact that we play a direct role on its creation (24/7) is one of the biggest lessons in life. The universe (which we are part of), being simply a basket of infinite probabilities simply awaits for our awareness and intention to choose its course (and consecutively our personal path).
I believe our physical confinement to 3 dimensional space is only due to our inability to perceive other dimensions that make it the universe as a whole. There are certain people who have exercised the ability to perceive higher dimensions (perhaps because this ability wasn't suffocated in the early stages of their lifes).
It's much like us living in the 3D world looking at people living in a 2D world (for example like cartoons on a flat screen). We in the 3D world know that there's 3 dimensions but the 2D people are not able to experience it, and are stuck living in "flatland" (even though the 3rd dimension is part of their universe).
So it has a lot to do with our capabilities of processing these higher dimensions. Perhaps our human nature hasn't exercised that ability due to not being a necessity to survival (in evolution concept), or it's just a repressed ability, but either way, it does not mean that our universe is all we currently perceive.
Back to the concept of time:
It may be that time is usually perceived as a dimension because is a convenient measurement for us human beings.
If we want to schedule a party with our friends we not only must specifiy the location (in 3 spatial dimensions) but also need a 4th coordinate which is the time of the party. The only difference is that this 4th coordinate seems to be unidirectional, unlike the spatial dimensions.
So time may be more of a measurement of the unidirectional nature of the concept of entropy and free energy, stating that all physical things are progressing to a lower more stable energy state and one that is higher in disorder (compared to it's initial state).
But the problem is that we are trying to make a lot of factors of the universe constants, and then build our learnings on that. This will snowball into wrong assumptions. Nothing in our physical world seems to be a constant - even the foundation concepts in which we built our learnings aren't constant - time, spatial dimensions speed of light, they are all ever changing and at different scales on every corners of the universe.
However, for simplicity sakes and bring some peace of mind, we assume that some of what we are perceiving is for all practical purposes constants.
Now we are at a critical point where we must throw out the window all those assumptions of constancy in order to make sense of things like quantum effects. Those assumptions aren't valid in this type of primordial layer of our universe.
We must also come to the conclusion that we are not mere observers of the universe, our simple presence in one experiment is impacting the outcome of it (everything is interconnected).
We would be fools to think that what we experience everyday isn't a direct result of of our actions in the now. We need to realize that every single thing we move or think is a piece of information that is stored in the collective conscious of the universe and that piece of information (no matter how insignificant it may seem) is directly changing the path this lifeforce which we are parts of.
Mike