The prediction of nuclear winter is drawn not, of course, from any direct experience with the consequences of global nuclear war, but rather from an investigation of the governing physics.

Some racists still reject the plain testimony written in the DNA that all the races are not only human but nearly indistinguishable. . . .

In the fabric of space and in the nature of matter, as in a great work of art, there is, written small, the artist's signature.

If we continue to accumulate only power and not wisdom, we will surely destroy ourselves.

The cure for a fallacious argument is a better argument, not the suppression of ideas.

We are star stuff harvesting sunlight.

The immense distances to the stars and the galaxies mean that we see everything ins pace int he past, some as they were before the Earth came to be. Telescopes are time machines.