The laws of history are as absolute as the laws of physics, and if the probabilities of error are greater, it is only because history does not deal with as many humans as physics does atoms, so that individual variations count for more.

If you're born in a cubicle and grow up in a corridor, and work in a cell, and vacation in a crowded sun-room, then coming up into the open with nothing but sky over you might just give you a nervous breakdown.

You must keep sending work out; you must never let a manuscript do nothing but eat its head off in a drawer. You send that work out again and again, while you're working on another one. If you have talent, you will receive some measure of success - but only if you persist.

The greatest weapons in the conquest of knowledge are an understanding mind and the inexorable curiosity that drives it on.

Scientific apparatus offers a window to knowledge, but as they grow more elaborate, scientists spend ever more time washing the windows.

The facts, gentlemen, and nothing but the facts, for careful eyes are narrowly watching.

[Social] science fiction is that branch of literature which is concerned with the impact of scientific advance on human beings.