A WORD FROM BERNANKE: Stocks opened lower, then rose after a letter surfaced from Federal Reserve Chairman Ben Bernanke suggesting the central bank might do more to try to prop up the economy.

WILL THEY OR WON'T THEY? Investors have been looking for clues all week about what the Fed plans to do. They hope that the bank's annual conference next week in Jackson Hole, Wyo., will provide some clarity.

CLOCK IS TICKING FOR GREECE: The Greek prime minister said his country needs more time to put in place spending cuts that Germany is demanding in exchange for bailout money. Some leaders in Germany are growing impatient with debt-stricken Greece.