When a scientist doesn't know the answer to a problem, he is ignorant. When he has a hunch as to what the result is, he is uncertain. And when he is pretty darn sure of what the result is going to be, he is still in some doubt. We have found it of paramount importance that in order to progress we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of certainty - some most unsure, some nearly sure, but none absolutely certain.

Turbulence is the most important unsolved problem of classical physics.

One does not, by knowing all the physical laws as we know them today, immediately obtain an understanding of anything much. I love only nature, and I hate mathematicians.

Religion is a culture of faith; science is a culture of doubt.

The truth always turns out to be simpler than you thought.

Science is the organized skepticism in the reliability of expert opinion

Winning a Nobel Prize is no big deal, but winning it with an IQ of 124 is really something.