From vocalists you may learn much, but do not believe all that they say." Robert Schumann's Advice to Young Musicians is replete with good counsel. How, what, and from whom we learn is thematic to many of these 20 nonfiction selections, chosen by their readers. We learn from the lives of valorous persons (Simón Bolívar; José de San Martín; Booker T. Washington; Ishi, the last Yana Indian); from literature (Political Naturalism in England; Editorial Prejudice Against the Occult; Barbara Frietchie); from journalists, activists, and the opinionated (America and the English Tradition; Interned by the Bolshevists; The Cholera; Chimney Sweeping; Diet & Hygiene; Progress in Dairy Farming; Concerning Tobacco; Beer & Cider), and from nature (Duck Hawks of Taughannock; Sponges & Sponge Fisheries; The Grand Canyon; and Social Wasps Polistes). Summary by Sue Anderson