Our common Neanderthal ancestor could be a million years old 💀🦴 The more we discover about our species' family tree, the harder it becomes to pinpoint when exactly Homo sapiens emerged, raising questions over what it really means to be human. "If we look along the sapiens lineage," says Chris Stringer, a palaeoanthropologist at the Natural History Museum in London, "we see there's lots of diversity. So it's not easy to make a cut-off point when we can say, this is Homo sapiens." Fossils from C