PYRIDINE ALKYL PERIODIDES.i. Pyridine Methyl Pentiodide.-This was obtained in the manner given in detail below, very satisfactorily in preparation I, and with slight impurity in two other preparations, II and III, by different ways, through separation from other periodides. 1 The substance isolated was a condensation-product of this with a second molecule of nitrotoluene ; but this is undoubtedly the primary reduction-product.2 Read at the Springrield meeting of the American Association for the Advancement of Science, September 2, 1895.

The interactive, digital future with its seductive vision of Internet-of-Things connected sensors, actuators and displays comes at a high cost in terms of both energy demands and the clutter it brings to the physical world. But what if such devices were made of materials that enabled them to self-power their interactive features? And, what if those materials were directly used to build aesthetically pleasing environments and objects that met practical physical needs as well as digital ones? In this paper we introduce PV-Tiles-a novel material that closely couples photovoltaic energy harvesting and light sensing materials with digital interface components. We consider potential contexts, use-cases and light gestures surfaced through co-creation workshops; and, present initial technological designs and prototypes. The work opens a new set of opportunities and collaborations between HCI and material science, stimulating technical and design pointers to accommodate and exploit the material's properties.

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In 2010, Wikileaks sprang to international prominence when it released two tranches of war logs documenting American military action in Afghanistan and Iraq. This was the first time data had been made available which documented the scale of American military action in those countries and the numbers of civilian casualties. The Afghan war logs comprised 91,000 military records, while the Iraqi files were even larger, containing 391,000 records.The huge number of documents posed great problems for the journalists from The Guardian and New York Times who worked on them. One journalist said that the experience was 'like panning for tiny grains of gold in a mountain of data'. 1 The Afghan logs were initially loaded into Microsoft Excel. One of the Guardian journalists recalled that:When I first got access to the database, it felt like being a kid in a candy shop. My first impulse was to search for 'Osama bin Laden', the man who had started the war.Several of us furiously inputted the name to see what it would produce (not much as it turned out). 2 However, Excel had serious limitations. After a while, it was realised that the spreadsheet had automatically truncated the import of the Afghan war logs after 66,000 records, so that a third of the records were missing from the journalists' initial searches. 3 A different approach was needed. Alastair Dant, the Guardian's data visualiser, explained that he could create a bespoke interactive visual display of the statistics. He used as a template an interactive map of the Glastonbury music festival previously produced by The Guardian. 4 This visualisation enabled journalists to follow day by day and year by year the struggle of the US Army to deal with thousands of improvised explosive devices in Afghanistan. It showed how ordinary civilians were the principal victims of these devices and vividly illustrated the ebb and flow of these incidents in response to political developments. For the first time accurate statistics of the death toll in Iraq could be produced. In addition to 3,771 dead US and allied soldiers, the war logs recorded 109,032 deaths of civilians, members of the Iraqi security forces and people classed as 'enemy '. 5 The way in which these journalists worked with this first tranche of Wikileaks material anticipated the methods that historians will in future need to adopt as they deal increasingly with born-digital historical records. The whole episode also served to illustrate the importance of who has access to what data. These logs were only available to journalists because they were leaked, an action which circumvented existing legal and national security frameworks. The stakes are not always so high, but barriers to and inequalities of access affect researchers working with all kinds of born-digital materials, and shape the kinds of analysis that can be undertaken, the types of people whose voices and stories may be represented. This is apparent from the over-representation of Twitter in social media studies, for example. Many more people use Facebook ...

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