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Over the last two centuries, as politics has evolved from the status of "amateurship" to that of profession, political discourse, together with its practices and their validity, has been increasingly subject to questioning. Politicians, as illustrated by the low turnouts that have recently characterised general elections and a general lack of interest in politics throughout Western countries, enjoy less than ever the trust of the electorate, and their discourse is now often criticised for being both hollow and untrustworthy. Conversely, by evolving from the status of enlightened amateur to that of expert, the figure of the scientist has, over recent centuries, gained credibility with the general public. Even though the traditional view of science as the expression of reality has regularly been challenged, science continues to be held in high regard and is believed to provide a reliable form of knowledge. Summoning science has thus often been a way, in everyday life, advertising and the popular media, to lend authority to a discourse, and imply that one's claims are beyond dispute. That politicians should have occasionally been tempted to do the same and make up for the deficit of legitimacy of their discourse through the instrumentalisation of scientific arguments or participation in contemporaneous debates on scientific issues is, therefore, not surprising. The issue at stake in this volume is to examine how, and to what extent, this process may have been taking place in the past three centuries. In order to accomplish this, the contributions cover various fields of expertise, ranging from the "hard" sciences to more controversial types of science, investigating the intricate relations of science and political discourse.