Not long ago, leukemia was a fatal disease. Thanks to treatment that includes a potent drug created from a Madagascar plant, today more than 70 percent of children can be cured.

Bats are the only native mammal on Puerto Rico today, but that was not always the case. Find out what Flemming has learned by rappelling down cliffs and climbing through caves on the island.

This biologist was inspired by the Swedish scientists he encountered as a youth in Ethiopia. Learn how his career studying freshwater systems continues on an international front.

Goodall's work studying and working to protect chimpanzees is legendary. Yet it is not the only conservation effort in which she plays an active role.

As head of the Department of Fisheries Resource Management for the Nez Perce tribe, Pinkham sees a strong link between the protection of biological and cultural diversity.

Traditional healers are among those hurt by logging and development of the rain forest. In Central America, they've joined forces with farmers and scientists to preserve Belize's plant diversity.