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In 1995, journalist Dava Sobel's Longitude caused an earthquake in the history of science community. The present article analyses how only recently historians of science have fully realized the novelty the book represented. In the meantime, the international success of popular books by journalists on the history of science has become a well-known phenomenon. The author suggests that the huge publishing success of Sobel's book ­ the "Sobel Effect" ­ has provoked three main kinds of reaction among historians: rejection, detachment, and imitation. Which of the three strategies is the best, for both public and authors?

Nowadays, India is experiencing a widespread diffusion of science communication activities. Public institutions, non-governmental organisations and a number of associations are busy spreading scientific knowledge not only via traditional media but also through specific forms of interaction with a varied public. This report aims to provide a historical overview of the diffusion of science communication in India, illustrating its current development and its future prospects.

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.

Internal scientific communication and public communication of science and technology are growing in Brazil at a good pace, along with scientific productivity. In this Focus we will try to analyze the debate on standard or alternative models of communication of science that can be seen in the practice of science journalism and popular science in Brazil.