The "X" stands for a (a "made-up" word like RingBeller ) used in a famous linguistic experiment conducted by researchers like Barry Lee Reynolds . The ".zip" suffix in your query likely refers to a digital archive containing the experimental materials, such as the novel used for the study. The Experiment: Learning Without Trying
: Why reading for pleasure is more effective for vocabulary than flashcards. X RingBeller.zip
: How many "RingBellers" a brain can handle before the story becomes unintelligible. The "X" stands for a (a "made-up" word
: Participants read a novel (often The Westing Game ) where certain real words were replaced with nonsense words like RingBeller . X RingBeller.zip