On Sat, Feb 1, 2014 at 11:30 AM, Jesse Mazer <laserma...@gmail.com> wrote:

>
>
> The fact that they can compare clocks, and agree for example that "twin
> A's turning 30 coincides with twin B's turning 40", is because they are
> making the comparison at the same point in spacetime (assuming ideal
> point-like observers*), and in relativity, all observers agree on which
> events coincide at the same point in spacetime
>

Sorry, ignore "The fact that" at the beginning of that sentence, it was
part of a different first sentence which I edited in writing up my message.

Jesse

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