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The human mind is stimulated by change, motivated by meeting the challenge of novelty or threat or pleasure, rewarded with the sensations of being instrumental in altering environments, and will persevere in this as long as there is some degree of perceivable progress. People turn to knitting baby booties, doing crossword puzzles, collecting rare coins; they may even make an effort to understand E=mc2 or to study the genetic adaptations of cacti, but in all cases, they need to see some fruit of their labors.
Michael D. O'Brien — Voyage to Alpha Centauri
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Voyage to Alpha Centauri
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