Children of migrant workers, known as “left behind children” because their parents have left to work in larger cities, and volunteers from the University of Science and Technology of China show off a Chinese national flag made from hand imprints at Lintou middle school in Hanshan county, Anhui province, July 21, 2009. The flag is 60 square meters large, to symbolize the upcoming 60th anniversary of the founding of the People’s Republic of China.