This is a groundbreaking discovery, it confirms the theory of different human species currently living side by side with some degree interbreeding.
The biggest question is why is it that the hybrides of the current human species are not sterile, as its the case in animaldom?
I think I have some elements of response...that is replacing the concept of sterile, by the one of "statistically more sterile", meaning a hybride is
likely more sterile than a normal mono-species human being
This theory is very easy to confirm, it only needs some statistical measures on the hybride human species.
B.