Tackling AIDS in Africa By Richard E. Stearns .... Special to The Times Six months ago, 19 young men boarded four jetliners and killed nearly 4,000 people. In an unprecedented outpouring of compassion, Americans donated more than a billion dollars in a matter of weeks to care for those affected by the terrorists' attacks and resulting crisis. Last week, two of our country's leading citizens boarded a plane to call attention to another crisis, one that has already killed 22 million people and threatens to orphan 40 million children by the end of the decade. Jimmy Carter, America's most-respected former...