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

Another thing I must point out is that you cannot prove a vague theory wrong. ... Also, if the process of computing the consequences is indefinite, then with a little skill any experimental results can be made to look like the expected consequences.

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

I'd hate to die twice. It's so boring. (Last words)

I think I can safely say that nobody understands quantum physics.

Nobody knows how it can be like that. (On quantum mechanics)

One of the most important tools of physics is the wastebasket.

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

There are 10^11 stars in the galaxy. That used to be a huge number. But it's only a hundred billion. It's less than the national deficit! We used to call them astronomical numbers. Now we should call them economical numbers.

The theoretical broadening which comes from having many humanities subjects on the campus is offset by the general dopiness of the people who study these things.

To understand ice you have to understand things that are themselves very unlike ice.

You must not fool yourself and you are the easiest person to fool.