Gravity is so strong that space is bent round onto itself, making it rather like the surface of the earth. If one keeps traveling in a certain direction on the surface of the earth, one never comes up against an impassable barrier or falls over the edge, but eventually comes back to where one started.

My first popular book, 'A Brief History of Time,' aroused a great deal of interest, but many found it difficult to understand.

The idea of 10 dimensions might sound exciting, but they would cause real problems if you forget where you parked your car.

Disability can be no handicap.

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.

A picture is worth a thousand words...and uses up a thousand times the memory.

I don't believe that the ultimate theory will come by steady work along existing lines. We need something new. We can't predict what that will be or when we will find it because if we knew that, we would have found it already!