I'd also like to note that, while the printed book is certainly not perfect at staying through the ages - something like stone tablets are probably best for that - it's a lot more reliable than online things. Maybe that'll change, but for now, tech companies go out of business a lot more frequently than floods or fires or other disasters strike the average house. And while, if Simon and Schuster go out of business, that doesn't do a thing to the books you have purchased from them, if Amazon goes out of business, there's no guarantee any of your Kindle will be readable anymore.