Image may be NSFW. Clik here to view.By Andrew Moran The blue-chip Dow Jones industrial average suffered its worst day of the year so far, plummeting more than 700 points as investors turned fearful about the U.S. economy’s health. At the Feb. 21 closing bell, the Dow Jones tanked 748.63 points, or 1.69 percent, to 43,428.02. The index registered a 2.5 percent […]