Bioscience:The Dawn of Humankind
The largest family tree in the world is growing. Every second of every day， four new people join the human race. Today， we number 5.5 billion. We differ in color， costume， culture and creed. Yet we are one species. Our origins have long intrigued scientists. Let's follow the scientists to see when did a primitive ancestor become human?
- Added：2006
- Country：America
- Duration：60
- Time of update：2011/8/17 16:03:35