"It is inevitable that those to whom is vouchsafed a long life of usefulness should outlive the friends of their youth."

"True science is never speculative; it employs hypotheses as suggesting points for inquiry, but it never adopts the hypotheses as though they were demonstrated propositions."

"As a great man's influence never ends, so also there is not definite finality, no end, to a great survey; it runs along for centuries, ever responsive to the strain of the increasing needs of a growing population and an enlarging domain."

"The atmosphere is much too near for dreams. It forces us to action. It is close to us. We are in it and of it. It rouses us both to study and to do. We must know its moods and also its motive forces."

"I wrote the very first stories in science fiction which dealt with homosexuality, The World Well Lost and Affair With a Green Monkey."

"Well, I had a lot of help from my father with the soldering and so on, and he was very good at math and was fascinated with computers, and so I was fortunate enough to have a bunch of exposure going all the way back to high school - this was in the 1960s."

"I tend to jot down moments, lines, interactions that don't really make any sense. I try and explain these scattered notes to my close friends, and they become more and more logical. I see screenwriting as a bit like a math equation which I have to solve."

"New discoveries in science will continue to create a thousand new frontiers for those who still would adventure."