> Intuitively, that seems unlikely to me; the society would have to be extremely stratified, geographically and genetically, with very little intermixing. That

> Intuitively, that seems unlikely to me; the society would have to be extremely stratified, geographically and genetically, with very little intermixing. That sounds right to me. Gated communities, luxury buildings vs slums, FiDi vs. Outer Sunset -- communities are incredibly stratified.