Stock futures rise ahead of Yellen?s speech,
 

Stock futures rise ahead of Yellen?s speech,
(Reuters) - U.S. stock index futures were higher on Friday, a day after the S&P 500 ended at an all-time high and ahead of Federal Reserve Chair Janet Yellen's take on the eco**my that investors will peruse for clues on the timing of a rate hike.http://i2.wp.com/reuters.us.feedspor...f?resize=1%2C1
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