Stocks go up and down, but eventually, most go up. So if you invest and hold on, odds are you'll do quite well. As my former Princeton economics professor, Burton Malkiel, told me, "The stock market is like a gambling casino with the odds in your favor. Over the long pull, it beats inflation, and beats it by a great deal."If you want to beat other investors, too, it's logical to think that you should turn to the most visible specialists for advice. These men and women make their living studying stocks, and they sound so confident on CNBC. You'd...