In part three, Lee Berger shares some of the challenges his team faced in the effort to recover the fossils, and he discusses Homo naledi's significance in understanding human origins. Many thought that the time for field exploration in the search for human origins was over. Then in 2013, paleoanthropologist and National Geographic Explorer-In-Residence Lee Berger made a remarkable discovery: While exploring the Rising Star cave system in South Africa, his team stumbled upon one of the greatest fossil discoveries in the past half century. They found a new species of human ancestor that could very well change the way we think about human ancestry and evolution.