That's, of course, the beautiful thing about science - that it's all about things we don't understand, not just the things we do understand.

You ask: what is the meaning or purpose of life? I can only answer with another question: do you think we are wise enough to read God's mind?

The greatest unsolved mysteries are the mysteries of our existence as conscious beings in a small corner of a vast universe.

If you want to have a program for moving out into the universe, you have to think in centuries not in decades.

A good scientist is a person with original ideas. A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering.

Technology must be guided and driven by ethics if it is to do more than provide new toys for the rich.

The idea that global warming is the most important problem facing the world is total nonsense and is doing a lot of harm.

Unfortunately the global warming hysteria, as I see it, is driven by politics more than by science.

In the end it is how you fight, as much as why you fight, that makes your cause good or bad.

So long as you have courage and a sense of humor, it is never too late to start life afresh.

Technology is a gift of God. After the gift of life it is perhaps the greatest of God's gifts. It is the mother of civilizations, of arts and of sciences.

Man is always prey to his truths. Once he has admitted them, he cannot free himself from them.

YESTERDAY, n. The infancy of youth, the youth of manhood, the entire past of age.

No duty, however, binds us to these so-called laws, whose corrupting influence menaces what is noblest in our being.

What is American music? The most satisfying answer I've come across is that it was a kind of natural comfort with the vernacular which is diverse and regional; it's not one particular set of sounds.

It feels nice to be wanted, to be reading and hearing good things about me, so I have to push myself.

Ignorance is not a simple lack of knowledge but an active aversion to knowledge, the refusal to know, issuing from cowardice, pride, or laziness of mind.

Pick your role models wisely, find out what they did and do it.

Because photos are testimony that someone did live. A reminder of past we may have loved or hated. A piece of our lives.

Artwork can be a portal, a kind of rethinking and reseeing of the world as we live it.

I swear that, not being able to be yours, I will belong to no one.