Fossils found in African cave are new species of human kin, say scientists

The two amateur cavers had to feel their way along the cave’s winding passages, crawl on their stomachs through an opening less than 10 inches high, ascend a jagged wall, cross a narrow ledge dubbed the “Dragon’s Back,” and make a 400-foot descent, sideways, through a vertical crack before finally arriving at the prize: a 30-foot-long chamber probably between 2 million and 3 million years old.