photo - In this photo released by China's Xinhua News Agency, an investor supports his head with a hand while looking at an electric stock price display at a trading hall in a securities firm in Shanghai, China, as the Shanghai Composite Index plummeted 3 percent to 2,325.95 Thursday, Feb. 21, 2013. It was the index's biggest loss in almost 15 months. World stock markets tumbled Thursday after U.S. Federal Reserve minutes gave investors an unwelcome reminder that super-easy monetary policy has an expiration date. (AP Photo/Xinhua, Ding Ding) NO SALES