Hey, stocks are up again! The Dow jumped 900 points today, the second-largest point gain ever. The largest point gain ever came two weeks ago, when the Dow jumped more than 900 points, only to crater once again in the following days. This illustrates the classic stock maxim, "Buy low, sell lower a day or two later as you're gripped by irrational panic." Click to watch the market's closing seconds, as traders in the background erupt in cheers. Hey guys, wild speculation on short-term stock price swings is serious business.