One of the great tragedies of mankind is that morality has been hijacked by religion.

It was one thing to have guessed it, another to have had that guess confirmed beyond possibility of refutation.

Reading computer manuals without the hardware is as frustrating as reading sex manuals without the software.

The choice, as Wells once said, is the Universe-or nothing. . . . The challenge of the great spaces between the worlds is a stupendous one; but if we fail to meet it, the story of our race will be drawing to its close. Humanity will have turned its back upon the still untrodden heights and will be descending again the long slope that stretches, across a thousand million years of time, down to the shores of the primeval sea.

Once you can reproduce a phenomenon, you are well on the way to understanding it.

How inappropriate to call this planet Earth when it is quite clearly Ocean.

In all the universe there is nothing more precious than mind.