Study researcher Svante Pääbo examines a 45,000-year-old femur from a Siberian man that is helping scientists pinpoint when Neanderthals and modern humans interbred. (Bence Viola, MPI EVA)
The DNA from the 45,000-year-old bone of a man from Siberia is helping to pinpoint when modern humans and Neanderthals first interbred, researchers say.
Although modern humans are the only surviving human lineage, others once lived on Earth. The closest extinct relatives of modern humans were the Neanderthals, who lived in Europe and Asia until they went extinct about 40,000 years ago.