How a tragic event resulted in a life-changing call for education. "Recalling the day he lost his sister, Hamid's eyes well up. "She would often remind us she wasn't a child any more. But she was always the baby, no matter how old she was." He often thought about ways to avenge her death by finding her killers. But then he found her notebook." Zainab Farahmand, writing in the Guardian, shares the remarkable story.