According to a unifying form of string theory known as M-theory, which is our best hope of uniting general relativity and quantum theory, space–time ought to have eleven dimensions, not just the four that we experience. The idea is that seven of these eleven dimensions are curled up into a space so small that we don’t notice them. On the other hand the remaining four directions are fairly flat and are what we call space–time. If this picture is correct it might be possible to arrange that the four flat directions get mixed up with the seven highly curved or warped directions. What this would
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