"Many human afflictions are diseases of the heart, the mind and the spirit. Western medicine can't touch those. I cure them." Deep in the Amazon rainforest, there are a small number of indigenous tribes who maintain a healing tradition that far pre-dates the development of modern medicine. In this powerful TED talk, ethnobiologist Mark Plotkin outlines the many challenges and perils that are endangering the tribes of the Amazon rainforest, and the urgent need to protect their irreplaceable wisdom. [Full Story]