[Have you eaten any DNA today? Science communication during Science and Technology Week in Brazil]

During the first National Science and Technology Week held in 2004, science centers and museums, universities and schools engaged in activities with the idea of divulging science to the people. Demonstrations of the extraction of DNA from fruits were conducted in supermarkets in 11 Brazilian cities by two institutions, DNA Vai à Escola and Conselho de Informação e Biotecnologia. This article describes the formation of a national network of people interested in communicating information about genetics to the lay public and the implementation of a low-cost science communication activity in different parts of the country simultaneously. It also analyzes the impact caused by this initiative and the perceptions of those involved in its organization.