(Los Angeles Times) – The killers came hunting their former teachers, gunning them down in their offices and in their classrooms. At the top of Boko Haram’s kill list: head teachers, examiners, primary school staff and science and geography teachers, whose curriculum contradicted the group’s flat-Earth ideology. The second lesson of the day was under way when terror came to Yagana Sanda’s school for primary and secondary students in Bama in northeastern Nigeria. Sanda ran for cover as screaming boys and girls scrambled to jump the school’s fence, some of them falling and breaking limbs. Two of the gunmen chilled her: Tukur had once been her brightest student, a earnest boy who had never missed a school day. Gomna had disrupted any class he was in until he dropped out early.