The cannabis experience has greatly improved my appreciation for art, a subject which I had never much appreciated before.

The absence of evidence is not the evidence of absence.

Scientists make mistakes. Accordingly, it is the job of the scientist to recognize our weakness, to examine the widest range of opinions, to be ruthlessly self-critical. Science is a collective enterprise with the error-correction machinery often running smoothly.

In the deepest sense the search for extraterrestrial intelligence is a search for ourselves.

Centuries hence, when current social and political problems may seem as remote as the problems of the Thirty Years' War are to us, our age may be remembered chiefly for one fact: It was the time when the inhabitants of the earth first made contact with the vast cosmos in which their small planet is embedded.

Man is a transitional animal. He is not the climax of creation

Cleverly designed experiments are the key.