The optimist thinks this is the best of all possible worlds. The pessimist fears it is true.

I can't think that it would be terrible of me to say - and it is occasionally true - that I need physics more than friends.

A pragmatist is concerned with results, not reality.

The optimist thinks this is the best of all possible worlds. The pessimist fears it is true.

Taken as a story of human achievement, and human blindness, the discoveries in the sciences are among the great epics.

When all thermonuclear sources of energy are exhausted a sufficiently heavy star will collapse. Unless fission due to rotation, the radiation of mass, or the blowing off of mass by radiation, reduce the star's mass to the order of that of the sun, this contraction will continue indefinitely.

It is not possible to be a scientist unless you believe that it is good to learn... that it is of the highest value to share your knowledge... with anyone who is interested... that the knowledge of the world, and the power which this gives, is a thing which is of intrinsic value to humanity