The development of full artificial intelligence could spell the end of the human race.

There is no way that we can predict the weather six months ahead beyond giving the seasonal average.

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.

We are entering an increasingly dangerous period of our history. But I'm an optimist.

There is a real danger that computers will develop intelligence and take over. We urgently need to develop direct connections to the brain so that computers can add to human intelligence rather than be in opposition.

Half the battle is just showing up.

Never put off the work till tomorrow what you can put off today.