人类进化1：混沌初开 Becoming Human: First Steps在线观看入口

Where did we come from? What makes us human? An explosion of recent discoveries sheds light on these questions, and NOVA's comprehensive, three-part special, "Becoming Human," examines what the latest scientific research reveals about our hominid relatives. 　　Part 1, "First Steps," examines the factors that caused us to split from the other great apes. The program explores the fo...