Students play during a break at a school in Haradh district of Hajjah Province, Yemen, Feb. 19, 2020. As of the end of 2019, the war in Yemen has forced more than two million children out of school and put 3.7 million others at high risk because of the non-payment of teachers' salaries, according to the United Nations Children's Fund (UNICEF). (Photo by Mohammed Mohammed/Xinhua)
