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A comment on Problem of Time.

Re:Problem of Time by enricozb on Sunday April 05, 2020 @05:37PM (#22788947)
> no known physical laws seem to require a single direction.

What would a physical law that required a single direction look like?

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Re:Problem of Time by hoorayimhelping on Sunday April 05, 2020 @05:51PM (#22789051)
I believe it looks like this: https://en.wikipedia.org/wiki/Speed_of_light

That physical limitation on how fast a mass can move is what keeps causality in check and things like the grandfather paradox from being possible.

Edit: now that I think more on it, this is probably a better law that ensures causality: https://en.wikipedia.org/wiki/Entropy#Second_law_of_thermody...

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