If I have questions about the universe on my mind when I go to bed, I can't turn off. I dream equations all night.

Unless mankind redesigns itself by changing our DNA through altering our genetic makeup, computer-genera ted robots will take over our world.

Quiet people have the loudest minds.

Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.

One could imagine such technology outsmarting financial markets, out-inventing human researchers, out-manipulating human leaders, and developing weapons we cannot even understand.

If we do discover a complete theory, it should be in time understandable in broad principle by everyone. Then we shall all, philosophers, scientists, and just ordinary people be able to take part in the discussion of why we and the universe exist.

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