“IN THE NUBA MOUNTAINS, Sudan — It’s not clear whether the Sudanese Air Force was trying to bomb the village of grass huts, or the girls high school next to it. Hamida Osman, 23, simply knew that a Sukhoi fighter jet was roaring toward her village. She grabbed her only child, Safarina, 2, and jumped into the foxhole that the family had built for those frequent occasions when Sudan decides to bomb its people.”