This week’s Please Explain is all about trails - from the ancient nomadic paths that travelers relied on for survival, to modern hiking trails that help us find our way in the wilderness. Robert Moor began writing his book, On Trails: An Exploration, while thru-hiking the Appalachian Trail in 2009. He’ll talk about animal trails (ants, buffaloes, elephants), long-lost Cherokee trails, and discuss the colonial origins of American hiking trails.