NEW YORK, United States (AFP) — Pop superstar Mariah Carey has revealed that she suffers from bipolar disorder and has entered treatment. The singer, whose sweeping five-octave vocal range helped make her one of the most successful artists of the 1990s, said she decided to go public to help remove stigma over the mental illness. “Until recently I lived in denial and isolation and in constant fear someone would expose me,” she told People in […]