The whole question of imagination in science is often misunderstood by people in other disciplines. ... They overlook the fact that whatever we are allowed to imagine in science must be consistent with everything else we know.

While I am describing to you how Nature works, you won't understand why Nature works that way. But you see, nobody understands that.

Science is of value because it can produce something.

It appears that there are enormous differences of opinion as to the probability of a failure with loss of vehicle and of human life. The estimates range from roughly 1 in 100 to 1 in 100,000. The higher figures come from the working engineers, and the very low figures from management.

For those who want some proof that physicists are human, the proof is in the idiocy of all the different units which they use for measuring energy.

We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.

There is enough energy in a single cubic meter of space to boil all the oceans in the world.