In a meta-analysis carried out in 2002, the two main associations of science centres and museums (ASTC, mainly US-centered, and ECSITE, mainly European) gathered all studies analysing the impact of science centres and museums on their local communities1. Four types of impact were identified: personal, social, political and economical. It was noticed that the vast majority of studies concentrated on the personal impact (that is, learning outcome, visitor satisfaction, etc.), while the latter three were largely neglected. The very fact of pointing this out, and many recent experiences - some of which are included in this commentary - show that there is now a shift of attention.

We live in a period where new media develops at amazing speed: the case of Youtube, becoming in few months one of the most visited website in the world, or the incredibly fast diffusion of audio and video podcasting, or the acquired relevance and authoritativeness of blogs in the dissemination of scientific information, are paradigmatic. Yet, there is little doubt that old media such as traditional television remain a reference for the largest sector of the population. Indeed, all surveys show that when dealing with scientific information, television remains the most relevant medium by a large majority of European (although in eastern Europe, due to a more trustful reputation, radio has also a particularly relevant position, and the internet is gaining favour among younger audiences).

The international symposium "Science on air: the role of radio in science communication" was held in Trieste on 1 and 2 October, 2004. To our knowledge, it is the first conference ever specifically held on science on radio, and it is certainly the first time science radio journalists, researchers, and media experts from 16 different countries met to discuss their journalistic practice and the role of radio in science communication. The main results are presented in this article.

The international symposium Science on air: the role of radio in science communication was held in Trieste on 1 and 2 October, 2004. To our knowledge, it is the first conference ever specifically held on science in radio, and it is certainly the first time science radio journalists, researchers, and media experts from 16 different countries met to discuss their journalistic practice and the role of radio in science communication. The main results are presented in this section.

"Il ciclotrone" is the weekly science programme of "Radio Popolare - Popolare Network". During the last 12 years, once or twice a month listeners have been able to directly ask questions to the guest scientists in the studios, or to express their point of view on some controversial scientific issue. Phone-ins at Radio Popolare are not filtered; regular and occasional listeners are used to communicate with or through the radio, and in doing so they contribute to the sense of spontaneity which characterise the programmes.