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That's a very good question. Our normal view of time is that it's a sort of "flowy" thing, but we can only really measure time by counting things that "tick". At the finest level of granularity we count off subatomic "ticks". Problem is, when we get down to really small scales (at the quantum level) we can't count events at all. I'm not even sure we can sense a direction of time at that level.
...And to be really pedantic about the whole thing....
Quote from: neilep on 14/12/2011 18:46:17...And to be really pedantic about the whole thing....If we are going to be really pedantic, then this clock would only be right once a day!