Fantastic Voyage II - Destination Brain

Despite the title, Fantastic Voyage II: Destination Brain is not a sequel to Fantastic Voyage, which is a novelization that Asimov wrote from the 1966 film of the same name. Asimov was never quite happy with the original novel because although he was able to change some of the scientific details, it was not entirely his own work. Therefore, he wrote Fantastic Voyage II as a new, separate story that shares only the central concept of miniaturized scientists entering a human body.
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