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Is this video accurate? Is time actually a dimensional axis based upon our model, or just a possible one? Or is a dimension's axis being duration or spatial irrelevant?

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Is this video accurate? Is time actually a dimensional axis based upon our model, or just a possible one? Or is a dimension's axis being duration or spatial irrelevant?	1
Why do certain physics models like m-theory/string theory only work in 11/26 dimensions and not say one less or one more?	1