The Kajo Keji Health Training Institute was born out of a dream of improving the health and lives of residents of South Sudan, the world’s youngest nation. After gunmen attacked the school last September, it seemed likely to become a casualty of a three-year civil war that has killed tens of thousands of people and sent more than 3 million fleeing from their homes. Now, like hundreds of thousands of South Sudanese, the school is rebuilding across the border in Uganda and waiting for peace to return to South Sudan.