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Why do your fingers and toes get wrinkly when they've been in the water too long? Short answer: Your nerves. Longer answer: Evolution. Hosted by: Michael Aranda

Are viruses life forms or not? Scientists have been fighting about it for years, and Anthony has more on the latest wrinkle in this seemingly simple yet age-old debate.

This case study follows purveyors of peas, Joel E. and Jolene Greengiant, as they learn about the origin, biochemistry, genetics and eventual artificial selection of sweet (wrinkled) peas, all in the context of evolutionary biology. This integrative approach employs both problem-based learning techniques and directed questions as students engage in a series of modules.