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Jan31-06, 12:12 AM
How do I know that 2 seconds is 2 seconds? They're equivalent by definition. However, according to Relativity, time is not invariable (neither is the "second"). So the "second" depends on which "clock" we are measuring. To agree on time, we must define what the standard clock will be.
i think what alkammy is trying to say is how do we know that it was a millionth of a second? it could be more...right?