'Evo-devo' -- short for 'evolutionary developmental biology' -- is a relatively new field of study that aims to explain how so many different life forms emerged from just a handful of genes. In this hour, we'll talk with leading evo-devo scientist, Sean B. Carroll, about his line of work.

Plus, a new study says exercise can lower your risk of developing dementia. While other studies have tied frequent mental exercise to helping keep the brain fit, this study looks at the effects of physical exertion. We'll find out more. Plus, a look at how wildlife biologists are tracking cougars via a virus.Call in with your questions and comments at 1-800-989-8255 (2-3 Eastern). Teachers, find more information about using Science Friday as a classroom resource in the Kids' Connection.

Guests:
Roman Biek
Post-doctoral Researcher, Department of Biology
Emory University
Atlanta, Georgia

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Sean B. Carroll
Author, "Endless Forms Most Beautiful: The New Science of Evo Devo" (W.W. Norton, 2005)
Investigator, Howard Hughes Medical Institute
Professor, Molecular Biology, Genetics, Medical Genetics
University of Wisconsin-Madison
Madison, Wisconsin

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Eric Larson
Director and Senior Investigator, Center for Health Studies
Group Health Cooperative
Seattle, Washington

Books/Articles Discussed:

"Endless Forms Most Beautiful: The New Science of Evo Devo," by Sean B Carroll. WW Norton, 2005.

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This segment produced by Annette Heist