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Ethnopharmacologist Dr Christophe Wiart speaks with a healer woman in the Philippines who describes how a medicinal plant is used to heal wounds. Christophe explains what he's doing and why it's important to record ancient tribal knowledge for science before it disappears. Many medical discoveries, from morphine to quinine and artemisinin, are derived from plants once used by traditional healers to cure disease. (Image: Philippines field and forest. Credit: Getty Images.)