Who knew you could make millions by insulting your customers? “Today, the “For Dummies” series has 125 million books in print, with an estimated 68 million buyers in the United States proudly proclaiming themselves to be dummies. Now a global phenomenon, the books have been translated into 39 languages and are easily recognized by their black-and-yellow covers and the “dummy” character in geeky oversized glasses guiding readers along.”