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.
“The box was a universe, a poem, frozen on the boundaries of human experience.”
“Having established that good ideas do indeed come in from the cold, start on the fringes and become mainstream, can we make any predictions about what the next move will be?”