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Everyone's perception of time is wrong. You all think that the universe has a past, present, and future. You all think that 13.8 billion years ago, the universe was born. Here's the problem: we live in the present, not the past or the future. Time is a Cairos, not a Chronos. Things happen only now, not in the future or the past.
 A Planck Second is the smallest unit of time. It is also, the only accurate amount of time because it is how long a "now" is. It's amazing to think that in a Planck Second, every atom in the universe moved.
 We don't know exactly how the universe was created, but we know there was a Big Bang. And we have evidence of it, but we can't experiment it unfortunately because, time is so elusive to all you physicists. The Big Bang was an explosion, and we understand our universe is 3D. Assuming that the Big Bang was Planck Second 0, we can assume time is actually 3D, and that it isn't necessarily linear. A line also forever extends in both directions, so time also went to the negative. Unfortunately, a Planck Second increments rather than decrements, so we don't get to live in the future first. Otherwise things would go backwards and well, we cannot even imagine a universe with time going backwards.
 With that said, is time travel. It can go in two directions, and only one of them is right: 1) Time does not get "stored" and so travel in time is not possible or 2) Time is "stored" and we can move only back in time. There is also 3) (sorry, I lied) that Time can be created.