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" "The superior strain of peas is the one whose genetic composition allows it to adapt to whatever environment it is presented with. People are not peas, but in one respect they are not very different from them: some have superior genetic composition to others.
Charles Sheffield (25 June 1935 – 2 November 2002) was an English-born mathematician, physicist and science fiction writer who served as a President of the Science Fiction and Fantasy Writers of America and of the American Astronautical Society.
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Where orbits are wildly varying, life has no chance to develop. Changes are too extreme. Temperatures melt tin, then solidify nitrogen. If it is once established, life is persistent; it can adapt to many extremes. But there is a fragility in the original creation that calls for a long period of tightly-controlled variations.