Jack Williamson quotes:

Life would have been absolutely empty without imagination.

We lived on isolated farms and ranches, far from anybody, and when I was young I knew very few other kids, so I lived to a great extent in my imagination.

That was quite an adventure, stopping at a different house each night, seeing new country,.

"Hard" science fiction probes alternative possible futures by means of reasoned extrapolations in much the same way that good historical fiction reconstructs the probable past. Even far-out fantasy can present a significant test of human values exposed to a new environment. Deriving its most cogent ideas from the tension between permanence and change, science fiction combines the diversions of novelty with its pertinent kind of realism.

I'm afraid Dr. Mondrick chose an unfortunate publicity device. After all, the theory of human evolution is no longer front page news. Every known detail of the origin of mankind is extremely important to such a specialist as Dr. Mondrick, but it doesn't interest the man in the street - not unless it's dramatized.

I'm a strict materialist - but the police are brutal materialists.

[Science fiction is] a specialized type of fantasy, in which the prime assumption usually is a new scientific discovery or invention.