By 1:00 this afternoon, the Dow Jones Industrial Average was down 316 points. It closed three hours later up 552 points. What's going on in this insane market? Let's turn to the experts: "The market’s abrupt about-face left investors and analysts grasping for explanations. 'I have no idea,' said Michael Feroli, an economist at J.P. Morgan Chase." There you have it. [NYT]