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As you say, the way string theory requires all these extra dimensions and this comes from certain consistency requirements about how string should behave and so on.

"Secrets of the Old One". "Groks Science" with Frank Ling, grokscience.wordpress.com. January 18, 2009.
As you say, the way string theory requires all these extra dimensions and this comes from certain consistency requirements about how string should behave and so on.