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Star Trek has inspired generations with its bold vision of science, technology, and the future. Yet even the franchise’s most imaginative episodes sometimes bend or break real-world science. From impossible temperatures to bizarre evolutionary leaps, these examples reveal moments where Star Trek’s science fiction clashes with scientific reality.
#1: Human bodies do contain sodium and chloride ions
Star Trek: The Original Series (1966) episode The Man Trap says a victim’s body contains no sodium chloride, or table salt, at all. Human bodies contain sodium and chloride ions, which are vital for nerves, muscles, and fluid balance. They usually exist separately in solution, rather than as salt crystals.
