Syrian refugee children play at an unofficial refugee camp in the northern Lebanese city of Tripoli, north of the capital Beirut, on September 2, 2015. More than 13 million children are being denied an education by Middle East conflicts, the UN says, warning "the hopes of a generation" will be dashed if they cannot return to classrooms. AFP PHOTO / JOSEPH EID        (Photo credit should read JOSEPH EID/AFP/Getty Images)