Orphaned youngsters, they fled their villages in Sudan in the 1980s, afraid they would be slaughtered as many of their families were by government troops. The lost boys - so called because they had to fend for themselves without parents or elders - set out on an extraordinary journey across Africa that took them to Ethiopia, back to Sudan and to refugee camps in Kenya. Three years ago, the United States government agreed to allow 3,600 of them to begin new lives in America.