Dow Jones Industrial Average Tumbles Nearly 100 Points; Nasdaq Composite Rallies Above 5,000 As Mylan NV (MYL) Shares Soar 8%

U.S. stocks closed mostly lower Tuesday, with the Dow Jones Industrial Average briefly dropping more than 100 points in afternoon trading, as shares of DuPont Co. (NYSE:DD) fell nearly 3 percent after the chemical company lowered its earnings outlook for the year, due to a strong dollar.