I was talking with my 17-year-old son recently, and he mentioned that Google (GOOG) must be one of the largest companies in the world. His reasoning, of course, stemmed from the fact that Google has all the answers on the Internet, and is now making a big splash in cell phones, too … and to teenagers, the Internet and cell phones are the center of the world. So I pointed out that many people never use the Internet or cell phones, and I mentioned, off the top of my head, a number of mass-market companies that had been around...