Beverly Sills, the Brooklyn-born opera diva who was a global icon of can-do American culture with her dazzling voice, bubbly personality and management moxie in the arts world, died Monday of cancer, her manager said. She was 78. It had been revealed just last month that Sills was gravely ill with inoperable lung cancer. Beyond the music world, Sills gained fans worldwide with a style that matched her childhood nickname, Bubbles. The relaxed, red-haired diva appeared frequently on TV talk shows, on "The Tonight Show," "The Muppet Show" and in televised performances with her friend Carol Burnett. Together, they did...