I'm smart enough to know that I'm dumb.

I believe that a scientist looking at nonscientific problems is just as dumb as the next guy.

It is our responsibility as scientists, knowing the great progress which comes from a satisfactory philosophy of ignorance, the great progress which is the fruit of freedom of thought, to proclaim the value of this freedom; to teach how doubt is not to be feared but welcomed and discussed; and to demand this freedom as our duty to all coming generations.

So this piece of dirt waits four and a half billion years and evolves and changes, and now a strange creature stands here with instruments and talks to the strange creatures in the audience. What a wonderful world!

The electron is a theory we use; it is so useful in understanding the way nature works that we can almost call it real.

Experiment is the sole judge of the validity of any idea.

Nature does not care what we call it, she just keeps on doing it.