so much for being here. >> thank you. okay. listen to this disturbing statistic. according to unicef, more than 150 million young girls and 73 million boys are sexually assaulted every year. children in conflict-affected countries are the most vulnerable. and shockingly, few perpetrators are ever prosecuted. the actress angelina jolie is working to change that. this week she's taking part in a global summit in london with the goal of ending sexual violence during war. jolie sat down with cnn's christiane amanpour about why she got involved. >> you are moved by someone you meet. and for me, it was -- it was time and again meeting young girls, boys and women and men who talked about publicly could talk about all of their pains but privately would become very emotional and tell me about the rape and what had happened to them or the child they couldn't -- you know, they