Eleni Gabre-Madhin is working to build Ethiopia's first commodities market. Re-establishing the profit motive for farmers, she believes, could help turn the world's largest recipient of food aid into a regional food basket.
Zeresenay "Zeray" Alemseged digs in the Ethiopian desert, looking for the earliest signs of humanity. His most exciting find: the 3.3-million-year-old bones of Selam, a 3-year-old hominid child, from the species Australopithecus afarensis.
Barcelona-based architect Xavier Vilalta works in Europe, Africa and the Middle East. He adopts and updates traditional design principles to construct modern buildings that truly suit their environment.
Bono, the lead singer of U2, uses his celebrity to fight for social justice worldwide: to end hunger, poverty and disease, especially in Africa. His nonprofit ONE raises awareness via media, policy and calls to action.