U.S. stocks opened weaker on Tuesday as investors worried about the outcome of the Greece talks and continued volatility in currency markets. The S&P 500 opened 6 points, or 0.3%, lower at 2,105. The Dow Jones Industrial Average lost 46 points, or 0.3%, to 17,991. The Nasdaq Composite began the session down 18 points, or 0.4%, at 5,064.
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