As our nation celebrates its founding, we're looking at where the environment and history meet. This summer 70 paddlers in kayaks and canoes took a trip down the Delaware River, including the spot where Washington crossed in 1776. A group of Pennsylvania residents is working to revive the colonial practice of growing flax one square yard at a time. We'll hear about an effort to preserve the records of a Pennsylvania coal company. An environmental history book about Pennsylvania aims to include multiple perspectives. Plus, a bill introduced in the U.S. House could help coal miners disabled by black lung disease. Cases of alpha-gal syndrome, which causes a red meat and dairy allergy from tick bites, have been showing up around Pennsylvania.