From exhibitions to theatrical performances, from fireworks to video games, countless events and ventures have been held all over the world in 2005 to mark the occasion of the World Year of Physics (WYP2005). The year that is drawing to a close has brought physics out into the streets and University campuses, but in a few cases physics has even invaded theater stages and art museums, it has involved musicians and even architects. The worldwide objective was to highlight a science that has more and more need to communicate its close connections with society, its involvement in themes that are vital for the present day but above all for the future, like the frontiers of medicine, the reduction of global pollution and the search for new energy sources. This focus tries to discover, country by country, the events that have accompanied the World Year of Physics. But this will also be an attempt to reply to a question on the very nature of this type of event: “do we really need it”? Is a World Year of Physics really necessary and, above all, is it effective?

The tsunami that took place on 26th December 2004 in the Indian Ocean and hurricane Katrina, that last August struck the Mexican Gulf, are two recent natural events that turned into catastrophes for mankind, causing several thousands victims. One of the reasons behind this can be traced back to the fact that useful information in the hands of scientists and experts did not reach the right people within the right time. A crushing defeat for risk communication was witnessed in these two recent events. All the more paradoxical since we live in what we like to name “the era of communication and information”.

During the last annual conference of ECSITE (European Collaborative for Science and Technology Exhibitions; Helsinki, June 2005), for the first time two discussion sessions were devoted to explainers, the innumerable people – young students mainly – who welcome visitors at exhibitions, museums and festivals, who animate laboratories and science shows, who guide, explain and lately also stimulate and manage discussions and participatory procedures. Thanks to the involvement of the speakers, who agreed to submit a broadened version of their papers, JCOM is glad to host the proceedings of these meetings. A great deal has to be done yet in order to analyse the complex European context and to fully understand the explainer’s professional profile.

This study presents the results of a qualitative analysis based on 13 crime news articles from Italian newspapers, to show that the belief that mental disorder predisposes many of those suffering from it to behave violently has endured, though the 180 bill was passed 25 years ago. Although the question has already been addressed by social psychologists and psychiatrists, it has not been discussed in great detail by science communication. However, this considers crime articles in newspapers as very interesting examples of indirect communication on health issues, where common belief prevails. The articles analyzed were about two matricides dating back to 1972 and 2001 respectively. The analysis showed that the belief that people with mental illnesses are recognizable, antisocial, can behave violently and cannot recover, has endured over many years. Nevertheless, statements about people with mental disorders are more accurate and the idea that the risk of violence among released mental patients is predictable, has been set aside.

Few research studies have been conducted on the interpreter’s role in a Science Centre. Although the importance of this role is always stressed by museum practitioners, it seems that anecdotal evidence is the main source of information on this theme. The experience of a visitor in a Science Centre as well as in other museums has, among other things, well defined social dimensions. These dimensions are crucial in determining the quality and enjoyment of a visitor’s experience. There is evidence that suggests visitors go to a museum to meet others. Among the people that visitors meet in a Science Centre are interpreters, who help them not only to use and understand the exhibits but also to become familiar with a new environment. The following sections will illustrate what research studies say about interpreters, considering their twofold relation with visitors and exhibit developers.

A review of two books recently published by Vieira & Lent, by the Casa da Ciência (House of Science) and by the Oswaldo Cruz Museu da Vida (Life Museum, Cruz/Fiocruz), "O Pequeno Cientista Amador – a divulgação científica e o público infantil", and "Terra Incógnita – a interface entre ciência e público" ("The Young Amateur Scientist - scientific divulgation and the youthful public", and "Unknown Land – the interface between science and the public") is presented.

Heureka is situated in the Helsinki Metropolitan area. Every year, on average, 300.000 visitors come to Heureka; it is one of the largest year-round attractions in the area. 20–25% of the visitors are school classes. Heureka has a main exhibition including Children’s Heureka and also always houses two temporary exhibitions. Special activities supplement the exhibitions: The Verne Theatre, Children’s Laboratory, The Open Laboratory, Science Theatre Minerva and the Basketball Rats.

Hiša Eksperimentov (The House of Experiments) is a very small science centre. We are situated in the centre of Ljubljana, the capital of Slovenia. The gross area of the centre is only 500 square meters and we meet around 25,000 visitors per year. We were opened for the public in the year 2000. In the Hiša Eksperimentov there are four full-time employees and around 10 persons working and paid by fees. There are specific institutions present in Slovenia so called Student services. They help students in finding paid job on daily basis. The state still encourages students to work by lowering the taxes for their job. There are around 25 students working as explainers in Hiša. Here are some facts about Slovenia. The population is around 2 million in the area of 20,256 square kilometers. There are 18 students per 1000 inhabitants. One can play a game with numbers – taking into account the area of Hiša and the population and area of Slovenia one can calculate that there is one person expected in an area of the size of 20 science centers. And there are even much fewer students present in the same area. But the number of visitors and students working in the center proves the density is larger. Therefore science centers do concentrate the population!

Techniquest was established in 1986, and in 1995 moved to its current premises at Cardiff Bay, South Wales. This was the first purpose-built science centre in the UK. It receives around 200,000 visitors every year to its exhibition, and to its programmes for schools and public audiences in the theatre, laboratory, discovery room and planetarium. The author joined the Techniquest project in 1985, became a staff member in 1990 and was the Chief Executive from 1997 until his retirement in 2004. Techniquest has three “out-stations” in Wales, and is responsible for the supply and maintenance of exhibits to the Look Out Discovery Centre in Bracknell, England. There is a Techniquest gallery at the Lisbon Pavilhão do Conhecimento - Ciência Viva, and a traveling exhibition, SciQuest, in South Africa which was also supplied by Techniquest. All these centres rely on the effective intervention of “Explainers” (at Techniquest we call them “Helpers”) to provide the best possible experience for visitors. At its most demanding, the tasks of an Explainer are varied and intensive, yet there may be times when the duties are mundane or even dull. When you rely on people to act as both hosts and housekeepers, to provide both support and stimulus, and to be both welcoming and watchful, you are asking a great deal. This article raises some of the issues concerned with the recruitment and retention of Explainers, their training and management, and the way in which their role is recognized and valued by the science centre as a whole.

One of the most common, and probably one of the crucial questions about science centers and interactive exhibitions is often phrased as “Ok, it’s fun, but do they learn anything?”. What follows is not an attempt to answer this question; we will just use it as a starting point for a discussion about the role of explainers in science centers. Explainers are usually very motivated people, possessing a genuine interest in science and technology and a scientific background they are eager to share. And they feel everyone else should be as enthusiastic about science as they are. This is a legitimate aspiration, of course, but how exactly does one try to achieve this goal? What is the explainer’s role? Quite often, the answer to the question “…but do they learn anything?” is: “Yes, if we teach them”. It is simple, straightforward, probably it works to some extent, and this is the reasoning that makes explainers become… well, explainers. And this should be avoided.