The pinpoints of starlight we see with the naked eye are photons that have been streaming toward us for a few years or a few thousand.

In essence, we string theorists have been trying to work out the score of the universe, the harmonies of the universe, the mathematical vibrations that the strings would play. So musical metaphors have been with us in science since the beginning.

I may be a Jewish scientist, but I would be tickled silly if one day I were reincarnated as a Baptist preacher.

To tell you the truth, I've never met anybody who can envision more than three dimensions. There are some who claim they can, and maybe they can; it's hard to say.

Physics grapples with the largest questions the universe presents. Where did the totality of reality come from? Did time have a beginning?

I like to think that Einstein would look at string theory’s journey and smile, enjoying the theory’s remarkable geometrical features while feeling kinship with fellow travelers on the long and winding road toward unification.

Energy is the ultimate convertable currency.