Though the Amazon charts are constantly in flux, one title that has been a staple near the top of the list for some time now is Oh, the Places You'll Go! by Dr. Seuss, which landed at #17 as of May 8. The book has been in the top 100 for 247 days straight, an impressive feat that's a tribute to the book's enduring message, as it was first published over 20 years ago in 1990. There are older books and books that have been in the top 100 for longer (The 7 Habits of Highly Effective People, What to Expect When You're Expecting), but none near the top 20.