A science teacher writes in a notebook before the start of classes in a school in the IDP camp in the UN base in Bentiu, Unity State, June 19, 2014. Around 39,000 people have found shelter in the UN base in Bentiu. About 1.5 million people have been displaced, including 378,000 who fled to neighbouring countries, according to the Office for the Coordination of Humanitarian Affairs (OCHA). REUTERS/Andreea Campeanu (SOUTH SUDAN - Tags: SOCIETY POLITICS)