Lake Champlain’s wild lake trout population is sustaining itself on its own again, but scientists aren’t sure what’s brought the fish back. Plus, voters in Bethel and Royalton shoot down a school bond for the third time, a new federal COVID vaccine policy gets mixed reviews from a leading state infectious disease specialist, plans move ahead for a Canadian entrance to a historic library that straddles the U.S.-Canada border, and the Milton selectboard appoints a new town manager.