Much of the Upper Midwest continues dealing with swaths of unhealthy air because of drifting smoke from Canadian wildfires, covering the northern region of the U.S. at a time when people want to be ...

"Sometimes we find something new that we were not looking for," the Wisconsin Historical Society said about the discovery.

The $8 million federally funded project is a part of the larger effort to clean up the most polluted and degraded sites in the Great Lakes.