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

We think we have solved the mystery of creation. Maybe we should patent the universe and charge everyone royalties for their existence.

Now, radical forward thinking is offering hope for the future: Replacement body parts to order. A team of scientists in California believe that if you can design them on a computer, you should be able to print them out.

The real challenge is to work out what aliens might actually be like.

If the total energy of the universe must always remain zero, and it costs energy to create a body, how can a whole universe be created from nothing?

I’m the archetype of a disabled genius, or should I say a physically challenged genius, to be politically correct. At least I’m obviously physically challenged. Whether I’m a genius is more open to doubt.

We believe human begins have existed for only a small fraction of cosmic history, because human race has been improving so rapidly in knowledge and technology that if people had been around for millions of years, the human race would be much further along in it's mastery.