U.S. stocks opened higher Wednesday, thanks to gains in energy and materials stocks which followed rising oil prices higher. The S&P 500 opened 10 points, or 0.5%, higher at 1,989. The Dow Jones Industrial Average added 100 points, or 0.6%, to 16,889. The Nasdaq Composite began the day up 17 points, or 0.4%, at 4,765.
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