Physics without mathematics is meaningless.

U.S. has lost a battle more important and greater than Pearl Harbor.

I claim that relativity and the rest of modern physics is not complicated. It can be explained very simply. It is only unusual or, put another way, it is contrary to common sense.

There is a time for scientists and movie stars and those who have flown the atlantic to restrain their opinions lest they be taken more seriously than they should be.

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.

[Chemistry] laboratory work was my first challenge. ... I still carry the scars of my first discovery-that test-tubes are fragile.