If we think about the peoples of the New World, these are people that came over the Bering Strait land bridge 10,000 years ago. And when they came over, they're not hauling tons of animals, and it's really cold. These are two factors that are going to really limit the amount of diseases that are coming into the New World. It was a healthy place to live. There is no black plague pre-Columbus in the New World. They're thriving for the most part. And there are estimates there's anywhere between 40 and 100 million indigenous Native Americans in the New World when Columbus comes.