Ordinary photons do have spin, they have a notion of helicity so they spin around their direction on motion.
More Quotes from 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
The basic theory in twistor theory is not to add extra dimensions.
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This book is about physics and its about physics and its relationship with mathematics and how they seem to be intimately related and to what extent can you explore this relationship and trust it.
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If you didn't have any conscious beings in the world, there really wouldn't be morality but with consciousness that you have it.
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I was indeed very slow as a youngster.
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Some years ago, I wrote a book called the Emperor's New Mind and that book was describing a point of view I had about consciousness and why it was not something that comes about from complicated calculations.
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