“Eyam was a small village in England. Back in the sixteen hundreds, the Black Plague struck the village. But after a year, most of Eyam still lived. Modern genetic studies revealed why. A rare mutation was present in the villagers. In a gene called Delta 32. It was a benign defect that was passed from one family member to another, and in such an isolated township, inbred as they were, a good portion of the town had acquired the mutation.
