Hal Clement wrote hard science fiction built around physical problems and worlds designed from scientific constraints. Mission of Gravity is set on Mesklin, a rapidly rotating planet with extreme variation in surface gravity, and follows the trader Barlennan as he helps a human scientific expedition recover equipment. Needle turns an alien-detective premise into a story about a symbiotic creature searching for a dangerous fugitive inside human hosts, while Close to Critical constructs another environment whose pressure and temperature shape every part of the plot. Clement's fiction is puzzle-driven and explanatory, with characters solving engineering or planetary problems step by step. It fits classic hard science fiction, planetary adventure and science-led speculative fiction. Read more Less
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