September 27, 2001

Psychologist Dr. Bruce Levine talks with Todd about how psychotropic drugs have come to be commonly prescribed. He tells Todd that he doesn't believe that enough is known about the effects of the most popular anti- depressants -- Prozac, Paxil and Zoloft.

Laughter may not be the best medicine, but researchers have discovered that laughter can enhance medical treatment. Sherry Dunay Hilber, founder of RX Laughter at UCLA's Johnson Cancer Center, tells Todd about the research she and her colleagues have done into how laughter can help patients withstand pain.

Scientist David Tilman of the University of Minnesota tells Todd about the study he's been conducting at a place called Cedar Creek. Cedar Creek is a 9 square mile study site about 30 miles north of Minneapolis. It contains three distinct eco-systems, boreal forest, deciduous forest, and prairie. Tilman has been studying how the different eco-systems respond to drought, changes in nitrogen levels in soul and changes in the numbers and kinds of species living in the area.