This article offers a 1953-present day review of the models that have popularised DNA, one of the fundamental molecules of biochemistry. DNA has become an iconic concept over the 20th century, overcoming the boundaries of science and spreading into literature, painting, sculpture or religion. This work analyses the reasons why DNA has penetrated society so effectively and examines some of the main metaphors used by the scientists and scientific popularisers. Furthermore, this article, taken from the author's PhD thesis, describes some recent popularisation models for this molecule.

To give a good public speech is art; but definitely more difficult is to organize a productive exchange of points of views between scientists, experts, non-experts and policy-makers on controversial issues such as a scenario workshop or a consensus conference. Many skills and a deep knowledge both of the topic and of the methodology are required. But this is the future of science communication, a field where the dialogical model will impose new and complex formats of communication and a new sensibility, using also the most traditional media. But are science communicators prepared for that? What is the state of the art of science communicator training?

Scientific information ­ from the moment it is produced by the scientific community until it reaches the non- expert audience through the newspapers ­ is submitted to a complex process of adaptation. In this paper, we investigate the process of accommodating the scientific information provided by a primary scientific source (a peer-review journal) into journalistic discourse (a newspaper). As case studies we analyzed four scientific papers published by the peer-reviewed scientific journals Nature and Science, which were simultaneously used as primary scientific sources by Latin American newspapers. We observed that the process of accommodation into a new space, journalistic space, represents a significant shift in the content of the texts, including information that appears, disappears and is transformed in the process; transformations in the lexica, the style and the argumentation; a change in the hierarchy of the information; a shift in the information emphasized and in the social impact it might have.

Dialogue in science communication is a necessity - everybody agrees on it - because science and technology issues are involved in so many aspects of the citizens life, and in so many cases can raise suspects, fears, worries or, on the contrary, expectations and hopes. But who are the possible interlocutors for scientists and policy-makers? Everybody, says Luisa Massarani, beginning with children and teenagers. Also in such controversial and sensitive issues like AIDS or GMO.

Within just a few months, new releases in the world of publishing have seen two books dealing with science and The Simpsons, one published in the US and the other in Italy: last spring, What's science ever done for us? by Paul Halpern (John Wiley & Sons, New York 2007) and, this autumn, La scienza dei Simpson by Marco Malaspina (Sironi Editore, Milano 2007).

The Norwegian Nobel Committee has bestowed the 2007 Nobel Peace Price equally upon the scientists of the Intergovernmental Panel on Climate Change (IPCC) and Al Gore, former vice-President of the United States of America, with the same motivation: «for their efforts to build up and disseminate greater knowledge about man-made climate change, and to lay the foundations for the measures that are needed to counteract such change».

An advanced expression of culture and of social evolution, contemporary technology, which increasingly incorporates endless quantities of scientific knowledge, has acquired a decisive power on human existence and on the natural system supporting it. It has the ability, now demonstrated, to attain a vast improvement in the quality of life ­ if one can benefit from proper amounts of it ­ and to prolong life for decades. On the other hand, its results may also go in a totally opposite direction, either against ourselves or our descendants, or other populations. A similar theory is true for life-supporting systems.

In 2007, global investments in R&D have increased by 7% on the previous year and have reached an absolute historical peak, exceeding for the first time the threshold of 1,100 billion dollars (calculated in the hypothesis of a purchasing power parity between the currencies). The world invests in scientific research and technological development 2.1% of the wealth it produces. At the same time, there has been an increase in the exchange of high added-knowledge value goods and high tech represents now the most dynamic sector of the world economy.

This article will briefly present a few theses and reflections of mine on some perversions and disruptions under way in knowledge development and in science representation. Nevertheless, I will abstain from exposing thoroughly the obvious and triumphal side of the coin. Namely, I am not going to extol the amazing fortune of science and knowledge, which have become the fundamental resource for development, at economic level in first place. Indeed, having reached a certain age, I can allow myself ­ although to a certain degree of oversimplification ­ less enthusiasm and a few old-fashioned ideas.

The past few decades have been marked by a rapid scientific and technological development. One of the most paradoxical, and perhaps more disturbing, features of this process is the growing divide between the increased importance science has acquired in economic and social life and a society persistently showing spreading signs of contempt, mistrust and, most of all, disinterest in research.