Whatever else there may be in our nature, responsibility toward truth is one of its attributes.

There is no space without aether, and no aether which does not occupy space.

We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'.

The helium which we handle must have been put together at some time and some place. We do not argue with the critic who urges that the stars are not hot enough for this process; we tell him to go and find a hotter place.

An electron is no more (and no less) hypothetical than a star. Nowadays we count electrons one by one in a Geiger counter, as we count the stars one by one on a photographic plate.

Events do not happen; they are just there, and we come across them.

So far as physics is concerned, time's arrow is a property of entropy alone.