Introduction: Science popularization, dictatorships, and democracies.

The study of science popularization in dictatorships, such as Franco's regime, offers a useful window through which to review definitions of controversial categories such as "popular science" and the "public sphere." It also adds a new analytical perspective to the historiography of dictatorships and their totalitarian nature. Moreover, studying science popularization in these regimes provides new tools for a critical analysis of key contemporary concepts such as nationalism, internationalism, democracy, and technocracy.