Around 5,000 years ago, at the dawn of the Bronze Age, a mass migration of peoples from the grasslands of the Eurasian steppe poured into Europe. Called the Yamnaya, these horse herders introduced Europe to the pastoralist way of life, shifting it away from its hunter-gatherer societies. The Yamnaya also left a lasting impression on the genetic landscape, one that endures today and from which chronic autoimmune diseases, like multiple sclerosis (or MS), likely originate.
