According to Plant Talk (2007), approximately 270,000 species of plants exist on Earth. The numbers of known species—including trees, flowers, fruits, and herbs—increases almost daily as scientists make new discoveries. From indigenous cultures in Australia to urban communities in the United States, and everywhere in between, plants are used in clothing, medicine, furniture, food, and symbolic and spiritual rituals. Ethnobotanists, such as Maria Fadiman, study this relationship between people (ethno) and plants (botany). In the rain forests of Latin America and African Savannas, home to hundreds of thousands of plant species, Fadiman works to help people and plants live in harmony.