Basicalley what i know is that Hitler's Aryan theory was based on idea's other people in the 1800's had that Nordic's. Or just the people around Scandinavia and other areas of north Europe who have always been known for blonde hair and light eyes since Europeans could write. Europeans though what we know now as Indo European languages were their languages. Then they found out Indians speak a language in the same family, Which is why it became known as Indo European. So alot concluded that a group of Europeans conquered India thousands of years ago and were the Aryans who based on over 3,000 year old Indian book were the people who brought Indo Iranian-Indo European language to India. Also some Indo Iranian ethnic groups like Pashuten were known for European features mainly light hair and eyes. So Germanic speaking people in Europe took this as people from their area conquered India and were the Aryans. They also sclaimed INdo European languages began in i think denmark. Then spread but Germanic people are the only pure Indo Europeans everyone mixed. And Hitler and other Germanic people at that time thought blonde hair and blue eyes was the perfect human and started with the INdo Europeans who i guess now they called Aryans. It has very very very very very little real historical evidence. For one think Germans and Scandinavians are not that related that is what DNA is now showing. Their only connection is proto Germanic speakers conquered far far southern Scandinavia 3,500-4,000ybp starting the Nordic bronze age then spread the Germanic language back down south. That is the only Gene flow that has connected Germans and Scandinavians. Besides that they have a diff ancestry. Also blonde hair and light eyes are most popular in non Germanic speaking Finnish and Baltic people and north west Russians. The high amount of blonde hair in Scandinavia comes from Pre Germanic people who had nothing to do with Indo Europeans. There is no such thing as the Nordic race well Scandinavians Swedish, Norwegian, and Finnish are from the same family but not Germans. Human history is extremely complicated and not one people group with certain physical features is completely dominate. It is just luck that certain people become successful everyone has the same ability to. There has been some DNA info published in june 2013 it came from some of the earliest Indo Europeans from 6,000 and 5,000ybp in Ukraine and southern Russia. What came back is they had pale skin like mod euro's and very dark eyes like the people in that area today. There is one thing that those scientists in the 1800's were able to track not all of them were nazis. It is true (based on ancient DNA) that the people who spread the indo Iranian language or were the first speakers they came from probably north central Russia orignalley and they did have mainly light hair and eyes which is why it pops up in Iran or whatever but had absolutely nothing to do with Germans.I really dont understand the idea that Nordic's or Germanic people are superior. They claim that they are were civilization comes from, Are u kidding me they had nothing to do with civilization till Rome taught them like in the 400's ad. mid easterns (Afro Asiatic-Semetic speakers) can claim they are the creators of civilization not Germans.