Books hold a wealth of information on whatever subject the author(s) has written about, but how we obtain books has changed. Sure, you can still head to a bookstore or library and find paper books, but many people prefer electronic books. A dedicated e-reader can hold thousands of e-books, not to mention tablets, phones, and computers can also have e-books on them. Amazon is one of the main e-reader manufacturers with its Kindle devices. The Kindle family has grown over the recent months to fit whatever style you want, and December is a popular time to give an e-reader due to the holidays. As such, Amazon announced it has sold four million Kindle devices in December, with one million being moved each week. Amazon did not say exactly of how many sold, but the new Kindle Fire remains the bestseller on Amazon. The retail giant has been pretty quiet on exactly how many Kindles have sold in general, but analysts predicted the Kindle Fire made up the majority of those one million devices a week.