Oliver Sacks is best known as an explorer of the human mind, a neurologist with a gift for the complex, insightful portrayals of people and their conditions that fuel the phenomenal success of his books. But he is also a card-carrying member of the American Fern Society, and since childhood has been fascinated by these primitive plants and their ability to survive and adapt. Now the best-selling author of Awakenings and The Man Who Mistook His Wife for a Hat brings his ceaseless curiosity and eye for the wondrous to the province of Oaxaca, Mexico.