When the world retreats: Volunteers are filling Sudan’s humanitarian void

As the sun set over Kosti last week, Noha Kamal arrived in the Sudanese city south of the national capital, Khartoum, clutching little more than her seven-year-old daughter, Ihsan, her newborn twins, and a few plastic bags.

As fighting escalated in South Kordofan state, the diabetic 34-year-old mother of three fled the state capital of Kadugli, leaving behind an unfinished brick house and her hu...