So when people ask me if I believe God created the universe, I tell them that the question itself makes no sense. Time didn't exist before the Big Bang, so there is no time for God to make the universe in. It's like asking for directions to the edge of the earth; the earth is a sphere, it doesn't have an edge, so looking for it is a futile exercise.

Time travel may be possible, but it is not practical.

I want to know why the universe exists, why there is something greater than nothing.

I don't think the human race will survive the next thousand years, unless we spread into space.

The fact that no one understands you doesn't mean you're an artist.

Science can lift people out of poverty and cure disease. That, in turn, will reduce civil unrest.

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.