How did the Nazis figure out whether a person or community is 'Aryan' or not?

Ultimately, what made a group of people “Aryan” or not came down to how much they wanted them to be “Aryan”.

Ja, well, Helmut, it’s very simple. Those hot leggy blondes are actually not Slavs at all but are, in fact, Aryans who got Slavicised. We need to rescue them from the pit of subhumanism that surrounds them by immediately giving them Aryan status!

If the Nazis wanted someone to be “Aryan”, they made up some cock and Bull story to justify it. If they wanted the opposite, they could be equally inventive in assigning someone to “Untermensch” status.

Third case of bird flu detected at commercial farm in Maricopa County - ABC15 Arizona

They used their “spidey sense”.

Nazi racism was not actually scientific, it was just a load of bullshit with a thin patina of “science-y” garwharbl to justify what was basically a totally ideological belief.

It was all bullshit the Nazis made up as they went along. Trying to cast it in real scientific terms is a waste of time.

Is there such a thing as "left wing fascism"? If not, what is an example of a political ideology that is often mistakenly labeled as "left wing fascism"?

And then we get sexy time with them!

Poles are “ugly, subhuman Slavs” but hey, Hermann, have you noticed how hot and blond those leggy Polish chicks look? They don’t fit our “subhuman” model at all! İn fact, they kind of look like our Aryan ideal personified!

And then we get sexy time with them?

Building the 'Moonhouse': Q&A with artist Mikael Genberg - Space