Avoidable human misery is more often caused not so much by stupidity as by ignorance, particularly our ignorance about ourselves.

If you are only skeptical, then no new ideas make it through to you.

There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.

Humans - who enslave, castrate, experiment on, and fillet other animals - have had an understandable penchant for pretending animals do not feel pain.

A still more glorious dawn awaits / not a sunrise, but a galaxy-rise / a morning filled with 400 billion suns / the rising of the milky way

Our ancestors lived out of doors. They were as familiar with the night sky as most of us are with our favorite television programs.

A central lesson of science is that to understand complex issues (or even simple ones), we must try to free our minds of dogma and to guarantee the freedom to publish, to contradict, and to experiment. Arguments from authority are unacceptable.