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>> It is worth nothing, however, that the time dimension is *not*
>> identical to the space dimensions (one would hope not!) and distances
>> are measured differently in time than in space.
>
> Well, AFAIK there's actually no fundamental reason to apply different
> "measuring tapes" to time and space: The constant vacuum speed of light
> can serve as a ruler for both, with the distance of a light second
> equating a second.
>
> It just happens that it's still more practical to use meters for
> space-like dimensions and seconds for time-like dimensions.
When you start measuring "events" which happen at different points in
space and different points in time, it becomes worth using a "spacetime"
measurement which simultaneously encodes both.
(Not that I know much about such things...)
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