Science fiction may seem like a genre of speculation, where its fanciful gadgets break the laws of physics with no concern for actual feasibility. Sometimes, though, it’s a template. Technology that we now take for granted often began in the imagination of sci-fi writers. Halfway through the 20th century, novelists began writing ‘hard’ sci-fi, adhering rigidly to the laws of physics. Powered exosuits in ‘The Forever War’ by Joe Haldeman are now in active development by the military; the
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