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.
“Do I think I can take 20 carries now? Well, I think finally last week and this is week was probably the first time I could probably say, yeah, I could take 20 carries and go do some damage.”