3-year-old Tutu, who is suffering from leukemia, plays next to his mother Zhang Wei in Hanshou county, Changde city, central China's Hunan province, 7 May 2015. A young boy called Tutu always sits quietly on a chair while his mother, Zhang Wei, conducts chemistry lectures in a classroom at Hanshou No. 1 high school in Hanshou county, Changde city, Hunan province. Due to Tutu's worsening health, brought on by leukemia, Zhang brings him to classes while she teaches--both as a comfort to her ailing three-year-old son and as a way to watch him while she earns what money she can from her job. Zhang and her husband have spent all their savings for Tutu's medical treatment, but they cannot afford the 700, 000 yuan (about 112, 000 U.S. dollars) it will cost to get Tutu a bone marrow transplant. Zhang donated her bone marrow to help her son, and several of her students have created an online campaign to help raise funds for Tutu's surgery. Zhang Wei returned to her job back in February after taking a semester off to attend Tutu while he was in hospital. Her husband is a middle-school teacher in a far-away remote town and cannot regularly return home, which leaves Zhang to take care of Tutu on her own.
