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.

It is reasonable to ask who or what created the universe, but if the answer is God, then the question has merely been deflected to that of who created God.

The concern here is that financial services become a kind of tech-led Wild West.

Over a very small number of rolls of the dice, the uncertainty principle is very important.

Of course it is possible that UFO's really do contain aliens as many people believe, and the government is hushing it up

I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming.

Science makes God unnecessary.