While the circumnavigation of the solar system seems farfetched, it may not be once the problem of effective anti-gravitational control is solved.

- Donald A. Wollheim

Human nature is violent, argumentative, fallible, and given to endless fantasizing.

- Donald A. Wollheim

I think that space flight is a condition of Nature that comes into effect when an intelligent species reaches the saturation point of its planetary h…

- Donald A. Wollheim