U.S. stocks closed modestly higher on Wednesday as a rally in health-care stocks helped propel stocks to gains during a shaky trading session. Analysts said that investors are still unwinding bets that stocks will fall further -- a crowded trading strategy that has produced big intraday-trading swings. The S&P 500 closed 15.90 points, or 0.8%, higher at 1,995.82. The Dow Jones Industrial Average added 122.10 points, or 0.7%, to 16,912.29. The Nasdaq Composite ended the day up 42.79 points, or 0.9%, at 4,791.15.
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