Science is like sex: sometimes something useful comes out, but that is not the reason we are doing it

One cannot understand... the universality of laws of nature, the relationship of things, without an understanding of mathematics. There is no other way to do it.

All theoretical chemistry is really physics; and all theoretical chemists know it.

The worthwhile problems are the ones you can really solve or help solve, the ones you can really contribute something to... No problem is too small or too trivial if we can really do something about it.

It is odd, but on the infrequent occasions when I have been called upon in a formal place to play the bongo drums, the introducer never seems to find it necessary to mention that I also do theoretical physics.

No problem is too small or too trivial if we can really do something about it.

Everything is made of atoms.