By Walt and Alex Breitinger, For The OklahomanThe possibility of the Federal Reserve moving interest rates below historic lows leads this edition of Futures File, our weekly commodities wrap-up: Janet Yellen yields on rates Falling stock prices have been painful for investors, and now they appear to be catching the attention of the Federal Reserve as well. Fed Chairwoman Janet Yellen testified before Congress last week, indicating that the Fed could back away from its plan to raise interest rates by a total of 1 percent in 2016.Read more on NewsOK.com