iPhone applications are becoming increasingly useful, from providing ways for you to track your efforts to pay off debt, to allowing you to write emails and surf the Web. iPhone apps have gone way beyond making light saber noises and playing Sudoku. Do you have a passion for learning? If so, your iPhone can help you be better informed — by keeping vital information at your fingertips. Here are 25 iPhone apps that can help the lifelong learner explore the world: [click to continue…]