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WebMD
Web Md: Understanding Corns and Calluses
This article from WebMD provides a great background on corns and calluses. Focuses on what they are and what causes them. The site also has links to information on the symptoms, detection, treatment and prevention of corns and calluses.
TOPS Learning Systems
Tops Learning Systems: Top Science: Monocots/dicots [Pdf]
Grow corn and bean seeds and measure their comparative growth over time.
Other
Ag Web: Agricultural Information, Tools, and Service
AgWeb.com provides the latest news in agriculture, as well as weather and market information, helpful agricultural tools, and more.