Back in Time, an IOS app that can be used with all ages, is described as best for Grades 6-12. The site TeachThought calls in an innovative educational app, and although it comes at a high ($7.99) price as apps go, it is sure to capture your interest and that of your students. It includes all subject areas. With a clock as a time-machine, it takes the user on a journey through history. TeachThought says that it “visualizes the mind-numbing scale of history.” There’s a trailer you can watch to determine if you want to purchase Back in Time and then travel with your students through time whenever you want.