It is probably safe to say that all the changes of factual knowledge which have led to the relativity theory resulting in a very great theoretical development are completely trivial from any point of view except their relevance to the structure of a theoretical system.

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I can look back at stuff I wrote in my early days and squirm at some of the mistakes I made. But we're all learning every day we never stop. I just hope people keep on liking what I do. That gives me such a kick.