In 2009, while thru-hiking the Appalachian Trail, Robert Moor began to wonder about the paths beneath our feet. On every scale of life on earth, he says, trails form that “reduce an overwhelming array of choices to a single expeditious route.” But how do they form? Why do some paths improve while others disappear? How does order emerge from chaos? Moor joins us Thursday to explore how pathways serve as an essential guiding force for trailblazers and trail followers, alike.