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" "Intelligence is too subtle an attribute to be inferred from appearance.
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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Once you were committed to a course of action, you didn’t waste your time looking back and second-guessing the decision, because every action in life was taken on the basis of incomplete information. You looked at what you had, and you did all you could to improve the odds; but at some point you had to roll the dice—and live or die with whatever you had thrown.