(Reprise airdate: July 22, 2026) Nan Evans talks with Thor Hanson, biologist and author, to explore the wonders of biodiversity. Biodiversity is the variety of life on earth from genes and species to ecosystems. Biodiversity encompasses the interactions between all living things, animals (including humans), plants, fungi, microorganisms and the environments they inhabit and communities they create. Biodiversity has been attributed with holding the world together.