Calculation Can someone explain the calculation used to date the divergance In other words how do ancient human mitocondria from the neanderthal period differ from neanderthals That is a very different question than applying a contemporanious species metric to aincent humans with those of today I find it odd that neandertals are considered non human when Archaic Homo sapiens evolved between 400 000 and 250 000 years ago Simialrly odd is this which shows two species of modern human