When we talk about systems, we usually think of big ones. Education, the government, the economy. But today, I want to talk about a system built entirely by nature, Yellowstone National Park.It's a breathtaking web of life. Rivers, forest, air, water. All connected in ways most people never see.Every creature has a role. Every sound has a meaning. Every action has a role.But about 100 years ago, we humans forgot that. In the 1920s, the US Biological Survey, which later became the US Fish and Wildlife Servic ...