To become a theoretical physicist ... you need to have a passionate love affair with the universe.

I hope we find evidence of dark matter in the lab and in outer space. This would go a long way to proving the correctness of string theory, which is what I do for a living. That is my day job. So string theory is a potentially experimentally verifiable theory.

I realized very early in life what my abilities and limitations were, and foreign languages was definitely one of my limitations. With strenuous effort, I just barely passed my French class at Harvard so I could graduate.

In science, nothing is ever 100% proven.

What do oil company executives, vampires and NASA bureaucrats all have in common? They fear solar energy.

This is a huge step toward unraveling Genesis Chapter 1, Verse 1-what happened in the beginning. This is a Genesis machine. It'll help to recreate the most glorious event in the history of the universe.

As Heinz Pagels has said, The challenge to our civilization which has come from our knowledge of the cosmic energies that fuels the stars, the movement of light and electrons through matter, the intricate molecular order which is the biological basis of life, must be met by the creation of a moral and political order which will accommodate these forces or we shall be destroyed. It will try our deepest resources of reason and compassion.