Knowledge is power. The smug feeling of winning a quiz at a board game, at a local bar or simply knowing the answer to random question is gold. This week's app is QuizUp, which is a good recommendation for teens and adults, arms with answers to history, geography, music, tv and hundreds more other topics. This app is developed by Plain Vanilla Corporation and falls under the game category. It currently has over 10 million users therefore a word of caution is necessary here for teens to play among friends and keep their information private.