Amazon’s Kindle has a new feature called Page Flip that could make reading a nonfiction book or textbook on a digital device easier and more productive. The feature is now available as a free download on Amazon’s own Kindle e-readers and Fire tablets, as well as the Kindle app on iOS and Android phones and tablets. Page Flip has a singular purpose: to make it easy to hop, skip and jump around a book while saving your place. You can skim past thumbnails of every page in a book, tapping to zoom in on any of those pages or zoom out to get a birds-eye view. There is also a thumbnail pinned to the screen that represents the last page you read, making it easier to go back to what you were just reading by tapping that pin.