Jon Davis, environmental physiologist, Course Manager for Biology, Arizona State University's Downtown Phoenix Campus, Phoenix, Ariz.
Ferran Garcia-Pichel, microbiologist, Dean of Natural Sciences, College of Liberal Arts and Sciences, professor, School of Life Sciences, Arizona State University, Tempe, Ariz.
Kevin Hultine, plant physiologist, Desert Botanical Garden, Phoenix, Ariz.
The Sonoran Desert, which spans some 100,000 square miles in southwestern North America, is one of the most diverse desert ecosystems in the world. Host Ira Flatow and guests discuss some lesser known desert creatures, and explore the secret life of that American southwest icon, the saguaro cactus.