[Vaquero]

The original European human genes(Neanderthal, heidelbergensis) in modern humans is the toughness that built railroads, cars, planes, and put man on the moon.

[Mr Ramsbotham]

The original European human genes(Neanderthal, heidelbergensis) in modern humans is the toughness that built railroads, cars, planes, and put man on the moon.

I'm more inclined to believe it was the intellectual and moral freedom fostered by Christian Western civilization.

[xzins]

That they could pro-create says they were just different breeds of the same species. Collies instead of coon hounds