This is an interactive book using the Kindle tap to magnify feature. It contains a set of questions related to U.S. States that you can tap to verify the answer. The book uses features of the new KFF8 format, and interaction will work on the devices that support that format (including Kindle Fire, Kindle e-ink, Kindle for PC and Kindle apps for phones/tablets. For Kindle of PC, mouse click will replace the task of tapping.