Former NBA star Yao Ming and Joakim Noah of Chicago Bulls talk with students during their visit to a primary school for children from migrant workers' families in Changping district in the northern suburbs of Beijing, Sunday, June 30, 2013. The visit is part of the Yao Foundation charity events in 2013, which inlcude a charity basketball game on July 1, 2013 in MasterCard Center in Beijing.