Young students take part in activities to celebrate the World Children's Day in the Palais des Nations in Geneva, Switzerland, on Nov. 20, 2017. Over 200 children and young people on Monday "took over" the Palais des Nations in Geneva, the UN's Geneva Headquarters, to mark the World Children's Day which falls on Nov. 20. (Xinhua/Xu Jinquan)

Young students take part in activities to celebrate the World Children's Day in the Palais des Nations in Geneva, Switzerland, on Nov. 20, 2017. Over 200 children and young people on Monday "took over" the Palais des Nations in Geneva, the UN's Geneva Headquarters, to mark the World Children's Day which falls on Nov. 20. (Xinhua/Xu Jinquan)

Young students take part in activities to celebrate the World Children's Day in the Palais des Nations in Geneva, Switzerland, on Nov. 20, 2017. Over 200 children and young people on Monday "took over" the Palais des Nations in Geneva, the UN's Geneva Headquarters, to mark the World Children's Day which falls on Nov. 20. (Xinhua/Xu Jinquan)

Young students take part in activities to celebrate the World Children's Day in the Palais des Nations in Geneva, Switzerland, on Nov. 20, 2017. Over 200 children and young people on Monday "took over" the Palais des Nations in Geneva, the UN's Geneva Headquarters, to mark the World Children's Day which falls on Nov. 20. (Xinhua/Xu Jinquan)

A girl takes part in activities to celebrate the World Children's Day in the Palais des Nations in Geneva, Switzerland, on Nov. 20, 2017. Over 200 children and young people on Monday "took over" the Palais des Nations in Geneva, the UN's Geneva Headquarters, to mark the World Children's Day which falls on Nov. 20. (Xinhua/Xu Jinquan)