The laws of science, as we know them at present, contain many fundamental numbers, like the size of the electric charge of the electron and the ratio of the masses of the proton and the electron .... The remarkable fact is that the values of these numbers seem to have been finely adjusted to make possible the development of life.

However difficult life may seem, there is always something you can do and succeed at.

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.

We are all different. There is no such thing as a standard or run-of-the-mill human being, but we share the same human spirit.

"Sooner or later disasters such as an asteroid collision or a nuclear war could wipe us all out, But once we spread out into space and establish independent colonies, our future should be safe."

Scientific discovery may not be better than sex, but the satisfaction lasts longer.

Our only chance of long-term survival is not to remain lurking on planet Earth, but to spread out into space.