Robert Moor’s On Trails is a wondrous exploration of how trails help us understand the world – from invisible ant trails to hiking paths that span continents, from interstate highways to the Internet. In 2009, while thru-hiking the Appalachian Trail, Moor began to wonder about the paths that lie beneath our feet: How do they form? Why do some improve over time while others fade? Over the next seven years, Moor traveled the globe, exploring trails of all kinds. With a breathtaking arc that spans from the dawn of animal life to the digital era, the whole of On Trails allows us to see our world, our history, our species, and our ways of life anew.