Interesting despite the Discovery 'sensationalism'. The
actual paper said:
"Therefore, in our view, this change in morphology of the mandibular chin among the fossils of Mezzena and other late Neanderthals could have been the result of a small degree of interbreeding with AMHs (anatomically modern human)."
As we all know, the human male will attempt mating with almost anything & anybody. So, to an AMH, that lush Thal babe in the cave next door would probably be a mighty fine conquest.
Ian