The Exploratorium explainer program is not only important to the young people involved, but is an integral part of the museum culture. This initiative that started to help the youth of our community has blossomed into a program that has been very helpful to the science centre. In fact, the institution would not be complete without the fresh energy of the explainers. They help the Exploratorium to continue to give the real pear to its public.

Human health has currently to face a growing series of global issues. From the spread of HIV/AIDS to a fresh outbreak of tuberculosis, increasingly drug-resistant, the world is witnessing a return, mostly unexpected, of infectious diseases. At the same time, the economic growth in many regions of the globe is generating a sort of “epidemics of wellbeing diseases”: obesity, diabetes, heart disease.

Peer training provides Explainers with the knowledge, skills and confidence to facilitate high quality interactions with visitors. These are skills that carry into their academic, personal and professional lives. Explainers report better grades in school, improved communication skills and better understanding of diverse learning styles. By devoting this high level of time and attention to this valuable resource, we can truly see the significant influence the science center can have on this most valuable, and often underserved, museum audience.

The creation of a scientific culture through the experiences that can be offered in a museum is the central theme in the training of guides at Universum. Emphasising the social importance of science democratisation, providing the public with the chance to enjoy science itself, conceiving it as a human creation of extreme beauty, giving it the chance to be appreciated and enjoyed, presenting it from the different fields where an approach to it is possible, is something difficult to achieve outside a science museum and impossible without the intervention of the anfitriones.

Explainers have a longstanding presence in science museums and centres, and play a significant role in the institutions’ educational agenda. They interact with the public, and help make visitors’ experiences meaningful and memorable. Despite their valuable contributions, little research attention has been paid to the role and practice of these individuals. From the limited research literature that does exist, we know that museum educators employ a complexity of skills and knowledge. We also know such educators have a variety of experiences and qualifications – this creates a rich diversity within the field. Finally we know that the content and quality of programmes designed to educate novice explainers vary across institutions. Should we work toward a shared identity across institutions? Or even a “professionalization”? The paper explores the state of the art of the discussion around that questions.

The importance the Brazilian government has given in the last few years to the dissemination of science points out the necessity of a more discerning analysis about the establishment of this subject on the public agenda and the related public policies undertaken. This work tries to contribute to the debate as an inquiry about the policies to popularize and disseminate Science and Technology (S&T) established by the Science and Technology Popularization and Dissemination Department, which was created in 2004. In order to do so, theoretical references from Public Policy Analysis, the Studies of Science, Technology and Society (SSTS), and Public Communication of Science are used. Furthermore, we analyze some of the results from research on Science and Technology Understanding carried out in Brazil in 2006. As a final point, this associated approach aims at identifying some of the limiting factors related to science dissemination actions in Brazil.

The Science House of the Federal University of Rio de Janeiro (UFRJ) is a space where science is approached through the perspective of culture, seeking interdisciplinarity, stimulating debate among different areas of knowledge, and building a closer and more pleasant relationship between society and scientific knowledge.  Work with mediators has gone through significant changes over time and the paths chosen have been modified, re-evaluated and transformed.  The presence of mediators can mean the possibility of dialog, conversation, informal chat, and sharing.  It has been one of the main channels of communication with the general public.

The initiatives focusing the professional development of explainers are multiplying around the world, building an informal network of researchers, museums managers and directors, explainers, and regional/continental networks, as THE group, the Thematic Human Interface and Explainers group of Ecsite.The Workshop Sul-Americano de Mediação em Museus e Centros de Ciência e Escola de Mediação em Museus e Centros de Ciência, which took place in Rio de Janeiro in September 2008, was a further important step along this path. We believe it is worthwhile to offer to Jcom readers some of the workshop contributions concerning the training of explainers, to which we added an overview of the general problem presented by Lynn Uyen Tran (Lawrence Hall of Science at the University of California, Berkeley).

Martin W. Bauer is right, two evolutionary processes are under way. These are quite significant and, in some way, they converge into public science communication: a deep evolution of discourse is unfolding, along with an even deeper change of the public understanding of science.

The world, all at once, has become a small world. Not only owing to TV, satellites and the Internet that allow us to jump from side to side of our planet in a click. But also owing to a phenomenon that evokes dry lands, devastating rains, tsunamis and hurricanes, torrid summers and melting glaciers: global warming. In the heated argument on this issue with so many people talking, in the past few years also artists have made their rising voice be heard. Artists-popularisers, aware of their role and of the considerable communication potential of the art medium. Because “One salient image, sculpture or event can speak louder than volumes of scientific data”.