Tales of a Shaman's ApprenticeBy: Mark J. Plotkin The fascinating account of a pioneering ethnobotanists travels in the Amazonat once a gripping adventure story, a passionate argument for conservationism, and an investigation into the healing power of plants, by the author of The Amazon: What Everyone Needs to Know For thousands of years, healers have used plants to cure illness. Aspirin, the world's most widely used drug, is based on compounds originally extracted from the bark