[AlexW]

I don’t know what is junk science about it.
I still recognize the three basic racial classifications.
It is the same as the three primary colors, reb, blue, and yellow.
Obviously, there are sub racial groups, as well as mixed races.
I will admit that racial classification gets harder every year with mixing, but there are still obvious distinctions between the 3 primary groups.

And yes, when did “African” become a race????

[Clemenza]

Because scientists who study geneology have discovered that various genotypes are scattered throughout the world, making it difficult to put anything in three categories.

The idea of the "caucasian" ie Aryan (Indo-Aryan) race comes from the (since disproven) belief that all Europeans are from the caucauses mountain region (present day Armenia and Georgia). That is why when some idiot calls me a "caucasian" I always say "do I look like a (expletive) Armenian to you?"

Under the old discredited system, all East Indians were referred to as "caucasoids", although genetics have shown this to be far from the truth.