each book in Amazon's Search Inside!™ program now features statistics computed from the text. next to a word cloud illustrating the most frequently used terms in a book, the statistical data includes indicators about a book's readability (i.e. the number of years of formal education required to read & understand a passage of text) & complexity (i.e. a score illustrating reading ease), the number of characters, words & sentences, & the "amount of words per dollar" or physical "weight".

[link: (example) & (help entry)|via |thnkx Mart!n]