There should be no boundaries to human endeavor. However bad life may seem, there is always hope.

The media need superheroes in science just as in every sphere of life, but there is really a continuous range of abilities with no clear dividing line.

We are entering an increasingly dangerous period of our history. But I'm an optimist.

One can't predict the weather more than a few days in advance.

No one undertakes research in physics with the intention of winning a prize. It is the joy of discovering something no one knew before.

Most sets of values would give rise to universes that, although they might be very beautiful, would contain no one able to wonder at that beauty.

Chaos, when left alone, tends to multiply.