Supplementary videos

Making Stuff: Smarter: 7:25: shark skin; 11:55 gecko feet
Medicinal leech (NOVA scienceNOW)
Maggot Therapy

Extra credit readings

• Food for thought: Crop diversity is dying New York Times 8/18/05
• Why Conserve Crop Genetic Diversity? WWF
• The Unfortunate Sex Life of the Banana Damn Interesting, 8/24/09
• The humble leech's medical magic BBC News Online 7/2/04
• Leech rides the tunnel of love New Scientist 2/11/95

Additional material

• Ethics and the Spotted Owl Controversy
• The Snail Darter Case: TVA versus the Endangered Species Act

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