突破孤立隔绝、僵化不变的史学成见，Henry Louis Gates Jr.博士讲述从人类诞生到二十世纪，二十万年来非洲的文明进化。　　In his six-hour 3 part series, Africa's Great Civilizations, Henry Louis Gat

　　An in-depth look at the prison system in the United States and how it reveals the nation's history of racial inequality.