Brazil and Science lost a unique figure on July 7, 2004, when Herman Lent died, at 93 years of age. Herman Lent was Emeritus Researcher of the Fundação Oswaldo Cruz, recipient of the Order of Scientific Merit in the category of Grã-Cruz in 2002, Member ofAcademia Brasileira de Ciências (Brazilian Academy of Sciences) and Lecturer and Researcher level 1A of Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq – National Research Council of Brazil). His memory and reasoning remained intact up to the last, and he never left off discussing problems related to science and mainly to ethics in human behavior with his colleagues at the laboratory, which he frequented assiduously.