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In the book, I make the point that here we have string theory and here we have twistor theory and we don't know if either one of them is the right approach to nature. - Roger Penrose In the book, I make the point that here we have string theory and here we have twistor theory and we don't know if either one of them is the right approach to nature. - Roger Penrose In the book, I make the point that here we have string theory and here we have twistor theory and we don't know if either one of them is the right approach to nature. - Roger Penrose