A remarkable property of superstring theory is that its self-consistency seems to fix the number of spatial dimensions, and that number is not three. Instead, the theory appears to work only in nine spatial dimensions, giving a ten-dimensional space-time.

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Quote text and notes from Wikiquote: Murray Gell-Mann (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.