Stocks, gold and silver jumped while U.S. Treasuries and the dollar sold off Wednesday after the Federal Reserve said it's expanding its economic stimulus program, known as QE3. The Fed will buy $45 billion a month in long-term Treasuries, to offset the expiration of "Operation Twist." The Fed will also continue buying $45 billion a month in mortgage-backed securities. The Fed said its stimulus programs would remain in effect until the