U.S. stocks opened sharply lower on Wednesday as investors grappled with a precipitous selloff in Chinese shares, lingering nervousness over Greece and the coming Federal Reserve minutes. The S&P 500 opened 16 points, or 0.7% lower at 2,066. The Dow Jones Industrial Average fell 140 points, or 0.8%, to 17,637. The Nasdaq Composite began the day down 40 points, or 0.8% at 4,957.
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