An expert is someone who knows some of the worst mistakes that can be made in his subject, and how to avoid them

An expert is someone who knows some of the worst mistakes that can be made in his subject, and how to avoid them.

Although the theory of relativity makes the greatest of demands on the ability for abstract thought, still it fulfills the traditional requirements of science insofar as it permits a division of the world into subject and object (observer and observed) and, hence, a clear formulation of the law of causality.

Even for the physicist the description in plain language will be a criterion of the degree of understanding that has been reached.

There are things that are so serious that you can only joke about them.

What we observe is not nature itself, but nature exposed to our method of questioning.