Well, I designed one! And I had some help, but lets go with, I made an app! It's for my real job over at BrainPOP Jr. It's free, you get to watch one free movie a week, take some quizzes, read a comic, hear a joke. If you've got kids K-3, try it out! Or if you wanna improve your own brains! Oh yeah, it works for iPads and iPhones!