A Neanderthal could probably move in, settle down, and no one would notice ~ except for his wife's four breasts and his bulbous skull ~ but I guarantee no one here would say a thing! Well, maybe a comment about "My word is that guy big ~ 700 pounds?!"
I think this business of having a genetically driven "square" heart is something that must have arisen in the depths of the Ice Age when people were not as well dressed as they are today ~ and no central heat either.
Oh, yeah, he'd no doubt drive only SUVs. We got a lot of those guys!
All the attributes that is used to describe Neanderthals can be found scattered throughout the human population today. For example, (I've read) some of the Australian Aboriginies have brow ridges that even exceeds that of the Neanderthals.