Every year, we ask one big question: What is a River? This year, the currents brought us to Dr. Robert Macfarlane—writer & professor—and his newly released book, Is A River Alive?, Dr Macfarlane joined us to explore that very question. From the chalk streams from his home in England to rivers across three continents, Macfarlane pursues his answers. In this episode, we move through his global journey, his new water literacy, and why he calls himself a teacher first.