Bad news for the estimated 80 percent of the human population that's allergic to the dreaded—and abundant—leaves of three.

Nikolai Ivanovich Vavilov's hypothesis on the evolution of rye is now accepted. But in the 1930s, his research got him arrested.

Where poison ivy comes from, why it gives some people such terrible reactions, and why—unfortunately for hikers and gardeners—its future is bright.

Farmers looking increase yields and maintain healthy soil are trying the old technique of planting cover crops again.