Great is the person who plants a tree knowing he will never sit under it.

The greatest discoveries all start with the question "Why?"

You don't let a historic site rot.

I learned how to order my thoughts, and most important, learned how to develop a plan. I discovered the power of a plan. If you can plan it out, and it seems logical to you, you can do it. And that was the secret to success.

I love all of the Earth.

There are more active volcanoes beneath the sea than on land by two orders of magnitude.

Everything I'm going to present to you was not in my textbooks when I went to school ... not even in my college textbooks. I'm a geophysicist, and [in] all my Earth science books when I was a student - I had to give the wrong answer to get an A.