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.

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Touring is tough. You're almost in a haze because you don't really know where you are half the time: You're in a hotel room one moment and the next thing you know you're onstage performing for 60 000 people then you're back on an airplane. It's very hectic and I couldn't do it without my family.