For each popular book, you'll find ranking information expressed as "X / Y," where "X" is the current ranking, and "Y" is what's called a moving average, that shows how the book has done in the last little while.

For example, a book that's listed as "2/7" is currently ranked second, and is doing better than it has been during the last little while. A book that's listed as "1/1" has been in first place for a while.

Rankings are updating every hour or so.

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