The concept of war crimes is an American invention.

A scientist is in a sense a learned small boy. There is something of the scientist in every small boy. Others must outgrow it. Scientists can stay that way all their lives.

As you lecture, you keep watching the faces, and information keeps coming back to you all the time.

The trouble with most of the things that people want is that they get them.

There's life all over this universe, but the only life in the solar system is on earth, and in the whole universe we are the only men.

A peacetime draft is the most un-American thing I know.

A scientist lives with all reality. There is nothing better. To know reality is to accept it, and eventually to love it.