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. – Stephen Hawking
In Britain, like most of the developed world, stem-cell research is regarded as a great opportunity. America will be left behind if it doesnt change policy. – Stephen Hawking