The more you learn, the more you know. The more you know, the more you forget. The more you forget, the less you know. So why bother to learn.

I believe that the long-term future of the human race must be space and that it represents an important life insurance for our future survival, as it could prevent the disappearance of humanity by colonizing other planets.

I believe everyone should have a broad picture of how the universe operates and our place in it. It is a basic human desire. And it also puts our worries in perspective.

So great a contribution to physics was Two New Sciences that scholars have long maintained that the book anticipated Isaac Newton's laws of motion.

It would be very difficult to explain why the universe should have begun in just this way, except as the act of a God who intended to create beings like us.

Unless mankind redesigns itself by changing our DNA through altering our genetic makeup, computer-genera ted robots will take over our world.

I'm here to chew gum and kick some ass, and I'm all out of gum.