Remember those funny smart guys/smart funny guys from YouTube who taught you boring subjects in a way they sounded really interesting? CrashCourse Video Series App encompasses all videos from Crash Course Team arranged as playlists. Trying hard to keep up with a playlist constantly losing track of where you were? Crash Course Video Series also marks of videos you have already watched. So now you dont have to depend on your browser bookmarks. You can also keep track of videos you have previously watched. Subjects included are: World History, Biology, Literature, Ecology, Chemistry, Psychology, and US History.