Niels Bohr

The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.

A physicist is just an atom's way of looking at itself.

An expert is a man who has made all the mistakes which can be made, in a narrow field.

I think it's obvious that democracy is something that is contagious, and it always has been.

Nothing is more dangerous than a dogmatic worldview - nothing more constraining, more blinding to innovation, more destructive of openness to novelty.

The difference between a democracy and a dictatorship is that in a democracy you vote first and take orders later; in a dictatorship you don't have to waste your time voting.