Two studies of the social networking site recently appeared in the Archives of Pediatric and Adolescent Medicine.

VOA: special.2009.02.18

Top students in the ninth and tenth grades can attend single-sex classes for math,science,English and social studies.

VOA: special.2010.12.02

"There is absolutely no difference in the content of social studies, history,geography,math and science.

VOA: standard.2010.07.12