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RE: The Limits of Scientific Knowledge
Yes there is an again, because I can stand on one leg now, and plan on doing it 1 minute from now, which would mean I'm doing it again. Mistakes can be repeated, doing things again and again.
We perceive time as separate from space, while spacetime is one thing. While we are infinitesimally minute beings, and our perceptions and experiences limited by our scope, the actuality of things, as you point out, isn't encompassed by our perceptions. What is, is far vaster and much more than we can know.
That doesn't mean that all beings are as limited as are we, and the perception of time by a being that transcended spacetime would not be limited to our perspective from within it. Such a being would not know an arrow of time; a string of instances of 'now', as do we. We can perceive an again, because we cannot perceive an omnitemporal now. This is not due to the nature of spacetime, but due to our limitations.
A blind cave fish cannot perceive light, but light exists nonetheless. Just so our perception of the passage of time.