Modern man is akin to a mongrel. Imagine how daft it would be to claim that a mongrel puppy that looks a bit like an Alsation is superior to another sibling which has the appearance of a Labrador.
If a horse and donkey can produce a mule, albeit sterile, how does one define a species?

@Petter Generally speaking, animals that can produce viable offspring together are considered as the same species. Horses and donkeys aren't because mules can't reproduce, but in your puppy example, both animals should be fertile.

In the article, it kind of implies that our ancestors (because I'm caucasian of European descent) bred with Neanderthals. However in this case, both "groups" are our ancestors.

@JimG African hominids seem to have mutated into quite a few varieties over the millenia. Neanderthals wandered into Europe and thrived there for a long, long time. Denisovans, it seems, wandered East. Another variation may have wandered west, across Africa itself and there are indications that yet other hominids wandered South. Many of the mutations themselves probably took place during the initial wanderings of the different groups. Finally, an even newer version wandered off from the area of the rift valley in all directions, competing and simultaneously conniving with earlier versions to produce "Homo Mongrelensis" - a hotchpotch of hominids. Today's Caucasians, Mongoloids and Negroids.
However, I think Negroids should be split into East and West Negroids, since East Negroids share more common genes with Caucasians and Mongoloids than they do with West Negroids.

@Petter it's all pretty interesting and with DNA testing combined.with archeological and anthropological studies, it's difficult to keep up with the advances in knowledge.

@JimG How very true. It also makes a mockery of bible stories on the origin of men.

@Petter That's true. I honestly hadn't even considered that.