Stocks fall again in turbulent trading; Dow down 500 points

U.S. stocks tumbled a second day, with major averages notching wild swings in heavy volume. Treasuries surged after a strong 30-year auction, the dollar fell with oil, and gold, that traditional safe haven, posted its biggest gain in more than two years.
The S&P 500 Index fell more than 2 percent for a second straight day and is now in its longest slide since 2016. The Dow Jones Industrial Average dropped more than 500 points in volatile trading that saw the benchmark gain and lose 300 point