In 2015 Lee Berger of the University of the Witwatersrand, Johannesburg, and his colleagues caused a sensation when they unveiled more than 1,500 human fossils representing some 15 individuals, male and female, young and old, discovered in South Africa. It was one of the richest assemblages of human fossils ever found, recovered from a chamber deep inside an underground cave system near Johannesburg called Rising Star. The team deduced that the bones belonged to a new species, Homo naledi, which had a curious mix of primitive traits, such as a tiny brain, and modern features, including long legs. The scientists determined it was a capable climber and long-distance walker and surmised that it had disposed of its dead in the pitch-dark, hard-to-reach chamber.