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" When a place gets crowded enough to require ID’s, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere. A woman is not property, and husbands who think otherwise are living in a dreamworld. The second best thing about space travel is that the distances involved make war very difficult, usually impractical, and almost always unnecessary. This is probably a loss for most people, since war is our race’s most popular diversion, one which gives purpose and color to dull and stupid lives. But it is a great boon to the intelligent man who fights only when he must—never for sport. A zygote is a gamete’s way of producing more gametes. This may be the purpose of the universe. There are hidden contradictions in the minds of people who “love Nature” while deploring the “artificialities” with which “Man has spoiled ‘Nature.’ ” The obvious contradiction lies in their choice of words, which imply that Man and his artifacts are not part of “Nature”—but beavers and their dams are. But the contradictions go deeper than this prima-facie absurdity. In declaring his love for a beaver dam (erected by beavers for beavers’ purposes) and his hatred for dams erected by men (for the purposes of men) the “Naturist” reveals his hatred for his own race—i.e., his own self-hatred. In the case of “Naturists” such self-hatred is understandable; they are such a sorry lot. But hatred is too strong an emotion to feel toward them; pity and contempt are the most they rate. As for me, willy-nilly I am a man, not a beaver, and H. sapiens is the only race I have or can have. Fortunately for me, I like being part of a race made up of men and women—it strikes me as a fine arrangement and perfectly “natural.” Believe it or not, there were “Naturists” who opposed the first flight to old Earth’s Moon as being “unnatural” and a “despoiling of Nature. "
― Robert A. Heinlein , Time Enough for Love
