I mean science was blamed for all the horrors of World War I, just as it's blamed today for nuclear weapons and quite rightly.

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.

Sometimes, when you really want to get to know a person but have boundaries that prevent you from doing so, you learn about them as much as you can.

Bringing a child into the world is the greatest act of hope there is.

The air will always be to filled with something. Your body too sore or tired. Your father too drunk. Your wife too cold. You will always have some excuse not to live your life.

The humans have a curious force they call ambition. It drives them, and, through them, it drives us. This force which keeps them active, we lack. Perhaps, in time, we machines will acquire it.

Patience and persistence are vital qualities in the ultimate successful accomplishment of any worthwhile endeavor.

In fact, writing for younger adults is tougher. They remember everything and if they spot a problem, they'll be sure to let you know.

Eating three times a day even if you're not hungry.

Change is inevitable, and the disruption it causes often brings both inconvenience and opportunity.

Nothing in the world is permanent, and we’re foolish when we ask anything to last, but surely we’re still more foolish not to take delight in it while we have it.

Life, with all it's sorrows, cares, perplexities and heart-breaks, is more interesting than bovine placidity, hence more desirable. The more interesting it is, the happier it is.