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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. - Roger Penrose 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. - Roger Penrose 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. - Roger Penrose