Society's emissions of carbon dioxide may or may not turn out to have something significant to do with global warming-the jury is still out.

The best weapon of a dictatorship is secrecy; the best weapon of a democracy is openness.

A state-of-the-art calculation requires 100 hours of CPU time on the state-of-the-art computer, independent of the decade.

If there ever was a misnomer, it is "exact science." Science has always been full of mistakes. The present day is no exception. And our mistakes are good mistakes; they require a genius to correct. Of course, we do not see our own mistakes.

My experience has been in a short 77 years that in the end when you fight for a desperate cause and have good reasons to fight, you usually win.

No endeavor that is worthwhile is simple in prospect; if it is right, it will be simple in retrospect.

A fact is a simple statement that everyone believes. It is innocent, unless found guilty. A hypothesis is a novel suggestion that no one wants to believe. It is guilty, until found effective.