The latest research into the link between germs and mental illness -- and what we all need to know.
Plants and animals introduced to new environments can have an irrevocable, unexpectedly destructive impact. Diane moderates a discussion about why such incidents–and efforts to fight them–are on the rise, and whether it’s even possible or advisable to try to control the phenomenon.
- Mark Sagoff University of Maryland Institute for Philosophy and Public Policy
- Gordon Brown U.S. Department of the Interior Council on Invasive Species
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