At a particular high point of tension, they let go for a moment. This could be as simple as stopping work and going to sleep; or it could mean deciding to take a break, or to temporarily work on something else. What almost inevitably happens in such moments is that the solution, the perfect idea for completing the work comes to them. After ten long years of incessant thinking on the problem of general relativity, Albert Einstein decided one evening to simply give up. He had had enough. It was beyond him. He went to bed early, and when he awoke the solution suddenly came to him. The composer
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