Note to Self: Stop Calling Interfaces “Natural”

The term “natural” is employed to describe a wide range of novel interactive products and systems, ranging from ges- ture-based interaction to brain-computer interfaces and in marketing as well as in research. However, this terminology is problematic. It establishes an untenable dichotomy be- tween forms of interaction that are natural and those that are not; it draws upon the positive connotations of the term and conflates the language of research with marketing lingo, often without a clear explanation of why novel interfaces can be considered natural; and it obscures the examination of the details of interaction that ought to be the concern of HCI researchers. We are primarily concerned with identify- ing the problem, but also propose two steps to remedy it: recognising that the terminology we employ in research has consequences, and unfolding and articulating in more detail the qualities of interfaces that we have hitherto labelled “natural”.

Simple fecal flotation is a superior alternative to guadruple Kato Katz smear examination for the detection of hookworm eggs in human stool

Microscopy-based identification of eggs in stool offers simple, reliable and economical options for assessing the prevalence and intensity of hookworm infections, and for monitoring the success of helminth control programs. This study was conducted to evaluate and compare the diagnostic parameters of the Kato-Katz (KK) and simple sodium nitrate flotation technique (SNF) in terms of detection and quantification of hookworm eggs, with PCR as an additional reference test in stool, collected as part of a baseline cross-sectional study in Cambodia.; Fecal samples collected from 205 people in Dong village, Rovieng district, Preah Vihear province, Cambodia were subjected to KK, SNF and PCR for the detection (and in case of microscopy-based methods, quantification) of hookworm eggs in stool. The prevalence of hookworm detected using a combination of three techniques (gold standard) was 61.0%. PCR displayed a highest sensitivity for hookworm detection (92.0%) followed by SNF (44.0%) and quadruple KK smears (36.0%) compared to the gold standard. The overall eggs per gram feces from SNF tended to be higher than for quadruple KK and the SNF proved superior for detecting low egg burdens.; As a reference, PCR demonstrated the higher sensitivity compared to SNF and the quadruple KK method for detection of hookworm in human stool. For microscopic-based quantification, a single SNF proved superior to the quadruple KK for the detection of hookworm eggs in stool, in particular for low egg burdens. In addition, the SNF is cost-effective and easily accessible in resource poor countries

The productive role of material design artefacts in participatory design events

ABSTRACT Physical design artefacts are employed in a wide range of participatory design events, yet there are few comprehensive discussions of the properties and qualities of them in the literature of the field. In this paper, we examine the productive role of material design artefacts in participatory design events. First, we offer a theoretical foundation for understanding material artefacts in design, based on pragmatist philosophy. Then, we employ this theoretical perspective to analyse a case in which a range of physical design materials was employed to envision and explore a projected building, the "Urban Media Space" a new library in Aarhus, Denmark. Drawing on examples from this case, we define a series of design considerations for employing material design artefacts in collaborative design events. Our contribution is valuable both in advancing the theoretical standpoint of interaction design in general, and in allowing participatory design practitioners to reflect on their use of material design artefacts when involving users