517 Number of weeks that the four books from Stephenie Meyer's "Twilight" series collectively have been in the top 150 of USA Today's Best-Selling Books Database. (If the weeks ran consecutively, they would span 9.9 years.) The first book in the series, "Twilight," has appeared in the top 150 for 158 weeks; "New Moon" (book two) for 168 weeks; "Eclipse" (book three) for 121 weeks; and "Breaking Dawn" for 70 weeks.
10.5 million Number of sheets of paper that were used last year in Princeton University campus clusters—equivalent to 100,000 reams of paper, or about 5,000 trees. Princeton cited this figure on its Web site when explaining why it is participating in the Kindle DX E-reader Pilot Program this fall. The university hopes that students’ use of the Kindle DX will reduce their desire to print or photocopy without hindering their ability to learn.