Students review lessons in class at Olomayiana West Primary School in Kajiado County, Kenya, on Feb. 15, 2017. Olomayiana West Primary School, located at a Maasai inhabited region in Kajiado County, has a special "classroom", which is open air under an acacia tree. Olomayiana West Primary School was founded in 2008 with only three classrooms donated by a local government parliament member. As the number of students and classes grow bigger, there are not enough classrooms for students from different grades to have classes at the same time. The dry climate and Maasai people's habit to rest and relax under trees offered a solution and therefore an open-air classroom with desks and a blackboard was set up under an acacia tree. (Xinhua/Sun Ruibo)