In 1968 Carlos Castaneda, a graduate student at UCLA, published The Teachings of Don Juan: A Yaqui Way of Knowledge
, describing his encounters with Don Juan Matus, a Yaqui shaman from Mexico. Don Juan supposedly trained Castaneda in ancient forms of knowledge, such as how to use drugs to communicate with animals (or even to become an animal). Castaneda's book became a bestseller and was an important influence on the New Age movement. However, although Castaneda insisted Don Juan was a real person, this is widely doubted by scholars who point out a number of curious omissions in the book. For instance, Castaneda never describes Don Juan speaking in his native language, nor does Don Juan use local names to describe any plants or animals. Castaneda also never showed his field notes to anyone. And many of the experiences Castaneda describes, such as hiking for days through the Sonoran desert in the middle of the summer, border on the impossible.