Ancient hominids may have left the trees, but we never abandoned them

If you're quickly trying to define what sets humans apart from other primates, you might first point to our greater intelligence and our capacity for complex language. The next big difference is that we walk on two feet and stay out of the trees... except, as this video explains, it's not quite that simple. » 1/01/13 2:59pm 1/01/13 2:59pm