The idea of racism that the Nazi theory means has been totally put aside by modern scientists, some of whom also disagree with the idea that the original Aryans ever lived in Europe. Most other scientists do maintain that the original Proto-Indo-Europeans did live about 5,000 years ago in the area in Europe east of Ukraine and north of the Caucasus Mountains and that the original Aryans (the "Indo-Iranians" or eastern branch of the Indo-European peoples) did migrate east to Iran and India from there, and the original ancestors of the modern "European peoples" (the western or "European" branch of the Indo-European peoples) did migrate west from there. This is called the Kurgan hypothesis.