It is no good getting furious if you get stuck. What I do is keep thinking about the problem but work on something else. Sometimes it is years before I see the way forward. In the case of information loss and black holes, it was 29 years.
“Rooting is following, and I don't do that, but I'd like to see the Phillies win because I love Philadelphia.”
“With my somewhat vague aspiring mind, to be imprisoned in the rude details of a most material life was often irksome.”