Jumped on strong earnings

Investors digested comments from Federal Reserve chairman Ben Bernanke and cheered strong corporate results from big companies including Apple and Boeing. The market regained momentum after the Fed chief said that the central bank remains "entirely prepared to take additional balance sheet actions."  Apple's nearly 9% pop made it one of the biggest gainers. The company reported that its net income nearly doubled, on much stronger-than-expected iPhone sales. Apple shares had been struggling ahead of its quarterly results, but Wednesday's rally helped push the stock back above $600 a share.