If you go to Wikipedia, and try to navigate from Rene Descartes to Computer Graphics - you will learn plenty about both subjects. More importantly, you are very likely to remember what you just learned because memory works through connections.
3 Degrees of Wikipedia makes this process into a social game. You will not only acquire new knowledge through solving connection puzzles, but also enlighten other players by creating your own and compete for the best problems.
Visit the App Store and get your brain boost today.