Unearthed skull revises understanding of human evolution

Aired: 10/18/2013 | 0:01:23 | Clip
Research based on a 1.8 million-year-old skull shows that human evolution may have followed a straighter line than scientists previously thought. The skull, unearthed in the former Soviet republic of Georgia, is the most complete ever found of a human ancestor and marks the earliest evidence of human ancestors leaving Africa.