This article investigates the contexts, or "listening niches", in which people hear popular music. The study spanned a century of popular music, divided into 10 decades, with participants born between 1940 and 1999. It asks about whether they know and like the music in each decade, and their emotional reactions. It also asks whether the music is associated with personal memories and, if so, wit...

The article by Homedes and Ugalde in this week’s issue of PLoS Medicine is an important addition to the global discussion about Mexico’s 2003 health reform, the Seguro Popular (SP) [1]. While this reform has been controversial in Mexico [2], it has been highly praised in international circles. The Lancet ran a special series on the reform in 2006, and former U.S. President Bill Clinton lauded S...

X-ray mapping (XRM) is the collection of characteristic x-rays as a function of the position of the scanning electron beam on the specimen. This analytical technique provides a high magnification image related to the distribution and relative abundance of elements within a given specimen. Consequently, XRM has become one of the most popular and useful methods of microanalysis and has been widel...

The "tree of life" iconography, representing the history of life, dates from at least the latter half of the 18th century, but evolution as the mechanism providing this bifurcating history of life did not appear until the early 19th century. There was also a shift from the straight line, scala naturae view of change in nature to a more bifurcating or tree-like view. Throughout the 19th century ...

Because my expertise is in early American history, I will concentrate on Larry Kramer’s portrait of pre-Revolutionary popular constitutionalism, which acts as a baseline against which to measure nineteenth-century developments. Before examining pre-Revolutionary constitutionalism, however, I want to note two features of Kramer’s style of historical argument that make the book a particularly sop...

IT is difficult to imagine a case more deserving of detailed historical analysis than that of John Roberton (1776-1840), a surgeon who practised as a specialist in the treatment of venereal disease in two European capitals' yet is linked to a subject, medical police, which, on close examination, occupied a fraction of his known professional life. Despite his widely published popular works on ve...

Existing scholarship on the debates over expertise in mid-nineteenth-century Britain has demonstrated the importance of popular writings on the sciences to definitions of scientific authority. Yet while men of science might position themselves in opposition to the stereotype of the merely popular writer, the self-identity of the popular writer remained ambiguous. This essay examines the careers...