A customer uses an automated teller machine at a Bank of America branch in Chicago May 7, 2009. Lessons from government "stress tests" of the 19 largest U.S. banks could provide a guide to improvements in financial supervision and regulation, Federal Reserve Chairman Ben Bernanke said on Thursday. Reuters Pictures 6 months ago

A customer uses an automated teller machine at a Bank of America branch in Chicago May 7, 2009. Lessons from government "stress tests" of the 19 largest U.S. banks could provide a guide to improvements in financial supervision and regulation, Federal Reserve Chairman Ben Bernanke said on Thursday.