Jawbones from an early human ancestor, found recently in northeast Ethiopia, could shine light on a murky period of human evolution, paleontologists say. The bones were found in the fossil-rich Afar region, just 20 miles (32 kilometers) north of the spot where the famed skeleton of "Lucy" -- early human ancestor who lived 3.2 million years ago -- was unearthed in 1974... The new bones are believed to date from 3.8 million to 3.5 million years ago. Though more research needs to be done, the group says the bones could bridge the gap between two known human ancestor species. Australopithecus...