David Montgomery is literally a rock star genius. Last year he was the MacArthur “Genius” Award Winner for his work in geomorphology (the study of Earth's surfaces) and his research has made fundamental contributions to the understanding of how soils and rivers have shaped civilizations, past and present. His new book, Dirt: The Erosion of Civilizations, a compelling mix of history, archeology, and geology, makes a persuasive argument that soil is humanity’s most essential natural resource. When he's not drawing the connections between humans and dirt, he's rocking out as the front man of "Big Dirt"

Seattle’s abuzz with people working to improve their neighborhood streets by making them better for walking, biking, transit and trees. development. Over the past couple of months Seattle unconsciously and unintentionally took back control of the streets. Find out how the city is shifting towards becoming a more walkable place.