risky behaviour causes it???) ATLANTA - Black Americans represent only 12 percent of the population, but we account for more than half of all new cases of HIV/AIDS. That frightening fact was one of the headline statistics to emerge from a conference in Atlanta last week held by the Centers for Disease Control and Prevention. The highest rate of infection in the country occurs among bisexual black men. And that has implications for black women, who are 19 times more likely to be infected than white women. That's because so many black men have unprotected sex with other men but...