The head of the U.N. refugee agency said Sunday that drought-ridden Somalia is the "worst humanitarian disaster" in the world after meeting with refugees who endured unspeakable hardship to reach the world's largest refugee camp. The Kenyan camp, Dadaab, is overflowing with tens of thousands of newly arrived refugees forced into the camp by the parched landscape in the region where Somalia, Ethiopia and Kenya meet. The World Food Program estimates that 10 million people already need humanitarian...