09/24/12 - Monday’s Topical Currents is with writer and naturalist William Bryant Logan. He's shown the complexities of simple topics in his books such as Oak and Dirt. His latest work is Air: The Restless Shaper Of The World. Breathing air gives us life and brings hurricanes, skydiving and fungus. It blows the dust which feeds the seas' food building block: plankton. We may forever fight dust at home but airborne particles bred South America’s rain forests.