RT Nick Szabo (@NickSzabo4)The spread of steppe herder genes into western Europe happened over 4,000 years ago, with no mass migration between then and the 20th century. In other words, relatively very stable for 4,000 years.In particular, the genetics of the Anglo-Saxons and the Normans were very similar to that of the Celts -- a steppe/EEF mix of practically the same proportions. So the genetic change they brought to the British Isles was extremely small compared to the mass migrations of the 20th and 21s ...