This paper discusses three mediation concept approaches and, consequently, three facets of mediator action.  The approaches presented start with a bibliographical review of the concept of mediation present in education and scientific communication studies.  These approaches serve as a basis for interpreting a semi-directive interview with the director of the Museum of Morphological Sciences of the Federal University of Minas Gerais (UFMG).  They also help us reflect on the complexity of organizing the objectives of a museum action that takes into account the transformational role of the meaning of objects in interaction with different socio-cultural subjects.  In conclusion, the museum's purpose in organizing a museum action using socio-cultural mediation approach and with the mediator as a passeur libre among exhibit objects and visitors is highlighted.

The knowledge deficit model with regard to the public has been severely criticized in the sociology of the public perception of science. However, when dealing with public decisions regarding scientific matters, political and scientific institutions insist on defending the deficit model. The idea that only certified experts, or those with vast experience, should have the right to participate in decisions can bring about problems for the future of democracies. Through a type of "topography of ideas", in which some concepts from the social studies of science are used in order to think about these problems, and through the case study of public participation in the elaboration of the proposal of discounts in the fees charged for rural water use in Brazil, we will try to point out an alternative to the deficit model. This alternative includes a "minimum comprehension" of the scientific matters involved in the decision on the part of the participants, using criteria judged by the public itself.

This article seeks to reflect on mediation in museums based on experiences that occurred in the “Learning in order to Teach” Project.  In this case, the mediation acquires specific characteristics because it deals with young deaf people learning art-related contents in order to teach other youth in their first language.  The most interesting aspect of this encounter between museum and deaf culture is a mutual, immediate and highly visible influence.  While museum-goers and professionals understand that the “gestures” used by the deaf are not random (rather, on the contrary, they make up a complex language), new signs are created by the students based on the contents that are worked with and discovered in the museum.  These new signs thus enrich the language itself and begin to circulate within the community.

Artists create new aesthetics to communicate new messages and new concerns. Apprehension about the climate, its changes, global warming and a disposition to anxiously running after an ideal sustainable development are part of the issues we all now experience with a certain degree of anxiety. This is why the sensitive antennae of artists have perceived and evolved that. Now they are committed on many fields to making their voice be heard and to raising ethical and social issues, also regarding the scientific instruments man possesses to manipulate nature. So they have now accessed the group of special interlocutors in the dialogue between science and society.

In January 2006, my wife Susannah Sayler and I set out to photograph landscapes around the world that were being transformed by global warming. We called our work The Canary Project. From the beginning, as now, we had both activist aims and artistic ambitions. These two types of motivation overlap in places and in other places feel completely distinct. In general, we feel as though are carrying forward a torch that science cannot carry any further. Following are some thoughts on our role as activists and as artists and as collaborators with the scientific community.

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”.

This article explores whether some scientists have now actually been developing a type of science apt to be published as a piece of news, yet lacking a relevant scientific interest. Possibly, behind this behaviour there may be the present working culture, in which scientists live under the pressure of the dictatorship of the Science Citation Index (SCI) of the reference journals. This hypothesis is supported by a study demonstrating that there is a direct relation between publishing scientific results in the press and a subsequent increase in the SCI index. Many cases are here described, selected among the papers published in Nature that – according to experts – have a media interest rather than a scientific one. Furthermore, the case of the Dolly sheep cloning is studied as a paradigm for a situation in which media coverage actually destroyed the research group.

The educational function of science museums was born with the first naturalistic collections ever, flourished in 16th-century Italy. The pedagogic thought and the educational experimentations carried out in approximately five century of history have allowed the educational mission of museums to acquire many different facets, drawing a task having an increasingly higher and complex social value. Recent publications explore these new meanings of an old role.

In the globalisation era, arts have provided food for thought on “how latitudes became forms”, to stress again that now, at global level, one should no longer define art as a contemplation “space”, but as an “environment”, a place for experience. On the other hand, already when Bern saw the inauguration of the historic exhibition “When Attitudes became Forms” in 1969, people realised that the problem was lying in the behaviour, in the attitude, of making arts towards the world. Basically, the formalistic concept of self-referentiality in a work of art was to be overcome, and attention was to be paid to procedures and contexts. In search of a new humanism in contact with the natural universe.

Science magazines have an important role in disseminating scientific knowledge into the public sphere and in discussing the broader scope affected by scientific research such as technology, ethics and politics. Student-run science magazines afford opportunities for future scientists, communicators, politicians and others to practice communicating science. The ability to translate ‘scientese’ into a jargon-free discussion is rarely easy: it requires practice, and student magazines may provide good practice ground for undergraduate and graduate science students wishing to improve their communication skills.