I suppose that every time there is difficulty. I remember about Space Mountain: It took us ten years before we found the technology that would allow such a ride. And during these ten years, I had a model that I kept, waiting for the technology we needed.
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.
Barack Obama hopes his famous health care victory will mark him as a transformative president. History, however, may judge it to have been his missed opportunity to be one.
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