Carioca 'da gema', sophisticated cosmopolitan, good-humored and, at the same time, deeply touched by the simplicity and traditions of small towns in Minas Gerais and the rural world, the scientist and humanist Carlos Chagas Filho left, in this One apprentice of science, a delicious an account of experiences, reflections and achievements that are the testimony of what is most significant, in the second half of the twentieth century, regarding the Brazilian presence in the field of relations between science, culture, nationality and citizenship. The work contains a beautiful booklet with photos, letters and texts that marked the author's life.