Roberto Trostli has been active in Waldorf education for more than twenty years, teaching lecturing, leading workshops, consulting, and writing. He is the author of numerous articles, a dozen plays for children, and the classic "Physics Is Fun! A Sourcebook for Teachers." He received his B.A. from Columbia University, which awarded him a fellowship for graduate study in medieval languages and literature at the University of Cambridge, England. When he returned, he worked for several years as a violin maker, before becoming a class teacher at the Rudolf Steiner School in New York City, which he...