Eozoön: debunking the dawn animal

Discovered in the nineteenth century by the Canadian Geological Survey, the Eozo?n canadense fossil, or 'dawn animal of Canada', created a sensation in the geological community. Only a few initially challenged its status as a fossil organism, including two professors in the remote Irish town of Galway. These men claimed that Eozo?n was nothing more than a mineral formation and did not represent the discovery of the primordial organism. Supporters of Eozo?n closed ranks and a heated debate soon broke out in a range of periodicals. The story of Eozo?n lays bare the construction of scientific credibility, a process that was threatened in the second half of the nineteenth century by the proliferation of popular science.     

It ain't just what you do and the way that you do it: why discourse matters in higher education communities of practice

A number of Australian universities have established and sponsored interdisciplinary communities of practice (CoPs) to develop teaching and learning. CoPs are popularly defined as groups of people who share a passion for something and, together, learn how to do it better. Without further specification, this definition is of limited use in understanding intentionally established CoPs in higher education settings. The term CoP is used and applied in a range of ways in higher education and has been accompanied by some scholarly debate about the meaning and relevance of CoPs to academe. The prevalent response to such debate has been to propose typologies. While typology can be useful, epistemology and discourse are also significant in understanding and developing higher education CoPs. In this paper I focus on discourse surrounding CoPs as a conceptual and developmental factor which has been insufficiently considered in the literature on higher education CoPs. I draw on findings from interviews with 33 CoP members and facilitators in three Australian universities. My findings indicate that discourse surrounding CoPs is significant in shaping notions of participatory value. Connecting with the literature, my findings also reveal a ‘big D’ Discourse of collegiality whereby CoPs offer social support and knowledge sharing to build capacity, as well as spaces in which a collegial academic identity can thrive. This coincides in complex and unpredictable ways with a Discourse of managerialism. I conclude that discourse should supplement typology and epistemology in adaptively shaping understandings of contemporary higher education CoPs and their future development.     

Supporting the fight against terrorism: A proposal for public library services provision for internally displaced persons in North-East Nigeria

This paper examined the state of the internally displaced persons (IDPs) in North-East Nigeria, the need to provide education and information services to the IDPs, and the role of libraries. It begins with the remote cause of the displacement. The paper also examined the state of the IDPs in terms of education and information services provision. It reported that the IDPs live in very deplorable conditions. There are no provisions for education and information services. The paper further discussed the importance of education and information to IDPs especially the children, teens, and youths. It recommended the empowerment and involvement of public libraries in the provision of education and information services to IDPs. It alluded that public libraries and librarians are better positioned to provide education and information services to displaced persons. The paper concluded that if necessary logistics and support are provided, libraries and librarians have the capacity to provide effective and efficient education and information services to IDPs and therefore bridge the current gap.     

Differentiation as measured by the Classroom Practices Survey: a validity study updating the original instrument

The Classroom Practices Survey assesses educators’ use of differentiated instruction with students achieving at average and high levels. The purposes of this study were to investigate if the Classroom Practices Survey (1) yields reliable and valid data from the groups for which it was originally designed and (2) can be used to evaluate teachers’ differentiation practices for students who achieve at low levels. Participants included 648 elementary teachers who completed the Classroom Practices Survey for students achieving at high, average and low levels. Confirmatory factor analyses revealed that the original six-factor model was not supported by the current data. Model fit was improved with a four-factor model, but did not reach the recommended values for good model fit. Further research and possibly modifications are needed before this tool is used by researchers and schools. This study highlights the importance of periodically evaluating instruments and revising them if necessary.

     

The Poor Get Richer: Heterogeneity in the Efficacy of a School-Level Intervention for Academic Language

We investigate the impact of a relatively brief cross-curricular intervention, Word Generation, on middle school students' development of taught academic vocabulary. Students (n = 8382) in forty-four middle schools in three urban districts were randomly assigned to treatment or control conditions. Treatment teachers implemented the program with minimal support and varying levels of commitment. Students in treatment schools scored almost a point higher on the curriculum-based vocabulary posttests than those in control schools (Hedges's g = 0.094, p < 0.05). Though there was no main treatment effect on the standardized measures of students' general vocabulary knowledge or reading comprehension, baseline-by-treatment interactions at the school and student level acted to attenuate the Matthew Effect in reading and vocabulary growth.     

Effects of Negative Political Advertising and Message Repetition on Candidate Evaluation

A great deal of televised political advertising is seen every electoral year. Expenditures on this type of political communication have reached the all-time high in the past elections. Clearly, political candidates believe that televised political advertising is an effective way to communicate with voters. This study investigates the effects of repetition of negative political ads on candidate evaluations. A pilot study shows situations in which repetition can both benefit and harm the evaluation of the sponsor of a negative political ad. The main study explores a factor that makes a negative political ad more effective, increasing positive reactions toward the sponsor and negative reactions toward the target of the ad. Implications of these results for society, attitudes, and learning are discussed.     

Understanding Chinese online users and their visits to websites: Application of Zipf's law

Competition for consumers to visit company websites has intensified in recent years. An important indicator of website popularity (and consequent survival) is the extent to which the website can draw consumer visits vis-à-vis other websites. A majority of the current understanding on consumer visits is limited to a single website, and leaves little knowledge on the performance of one website compared with others. In tracking the Internet usage behavior of 200 individuals in Mainland China for 30 consecutive days, we applied Zipf's law to identify the divergence points separating popular websites from non-popular ones. Two measurements were used, namely, visit traffic (number) and visit engagement (time spent). We observed that 94.87% of the entire visit traffic is devoted to 15.08% of all visited websites, whereas 84.63% of engagements are on the top 6.16% visited websites. These findings suggest that few websites accounted for the bulk of online traffic and time. Further, we segmented the dataset based on two key proxy variables of user demographics, which are gender and occupation. The findings on visit traffic remained salient after considering user segments, but the findings on website engagement varied across different user segments. Our further analysis, which categorized the visited websites by their main service, revealed the type of Internet users attracted to popular websites.     

Marathon progress: demography,morphology and environment

Abstract

As opposed to many other track-and-field events, marathon performances still improve. We choose to better describe the reasons for such a progression. The 100 best marathon runners archived from January 1990 to December 2011 for men and from January 1996 to December 2011 for women were analysed. We determined the impact of historical, demographic, physiological, seasonal and environmental factors. Performances in marathons improve at every level of performance (deciles). In 2011, 94% of the 100 best men athletes were African runners; among women athletes they were 52%. Morphological indicators (stature, body mass and Body Mass Index (BMI)) have decreased. We show a parabolic function between BMI and running speed. The seasonal distribution has two peaks, in spring (weeks 14 to 17) and autumn (weeks 41 to 44). During both periods, the average temperature of the host cities varies close to optimal value for long distance race. African men and women runners are increasingly dominating the marathon and pushing its record, through optimal eco-physiological conditions.