We show that previous results from epistemic network models showing the benefits of decreased connectivity in epistemic networks are not robust across changes in parameter values. Our findings motivate discussion about whether and how such models can inform real-world epistemic communities. As we argue, only robust results from epistemic network models should be used to generate advice for the real-world, and, in particular, decreasing connectivity is a robustly poor recommendation.

In this paper, we examine the relationship between general relativity and the theory of Einstein algebras. We show that according to a formal criterion for theoretical equivalence recently proposed by Halvorson and Weatherall, the two are equivalent theories.

A classic result in the foundations of Yang-Mills theory, due to J. W. Barrett ["Holonomy and Path Structures in General Relativity and Yang-Mills Theory." Int. J. Th. Phys. 30, ], establishes that given a "generalized" holonomy map from the space of piece-wise smooth, closed curves based at some point of a manifold to a Lie group, there exists a principal bundle with that group as structure group and a principal connection on that bundle such that the holonomy map corresponds to (...) the holonomies of that connection. Barrett also provided one sense in which this "recovery theorem" yields a unique bundle, up to isomorphism. Here we show that something stronger is true: with an appropriate definition of isomorphism between generalized holonomy maps, there is an equivalence of categories between the category whose objects are generalized holonomy maps on a smooth, connected manifold and whose arrows are holonomy isomorphisms, and the category whose objects are principal connections on principal bundles over a smooth, connected manifold. This result clarifies, and somewhat improves upon, the sense of "unique recovery" in Barrett's theorems; it also makes precise a sense in which there is no loss of structure involved in moving from a principal bundle formulation of Yang-Mills theory to a holonomy, or "loop", formulation. (shrink)

La pandemia de la COVID-19 evidencia posibilidades, límites y nuevos desafíos para la ciencia abierta. En este artículo se presentan los resultados de una investigación que tuvo como objetivo contribuir a la comprensión del papel de la ciencia ciudadana, una de las vertientes de la ciencia abierta, en el abordaje de los problemas plantados por la pandemia. Para ello, se llevó a cabo una revisión de literatura especializada y se acometió la identificación y la categorización de estas iniciativas ciudadanas en (...) Brasil durante el periodo del brote de COVID-19. Los resultados de esta investigación muestran un aprendizaje mutuo entre los abordajes de la ciencia ciudadana y las acciones participativas para reducir los riesgos de desastres. Este aprendizaje, por un lado, fortalece el papel de la producción ciudadana de datos, información y conocimiento relevante para la prevención, resiliencia y gestión de estos riesgos; y, por otro lado, dilata el alcance de la ciencia ciudadana para afrontar situaciones de emergencia y desastre, al tiempo que refuerza el carácter situado de este enfoque. [pt] A pandemia da COVID-19 evidencia possibilidades, limites e novos desafios à abertura da ciência. Neste artigo, apresentam-se resultados de pesquisa que objetivou contribuir para o entendimento do papel da ciência cidadã, uma das vertentes da ciência aberta, para lidar com as questões postas pela pandemia. Além de revisão da literatura, o estudo envolveu a identificação e a categorização de iniciativas cidadãs dessa natureza, no Brasil, durante o período de eclosão da COVID-19. Observa-se o aprendizado mútuo entre as abordagens da ciência cidadã e as ações participativas para redução de riscos de desastre. De um lado, fortalece o papel da produção cidadã de dados, informações e conhecimentos relevantes à prevenção, resiliência e gestão desses riscos; e, de outro, alarga o escopo da ciência cidadã para o enfrentamento de situações de emergência e desastre, ao mesmo tempo em que reforça o caráter situado dessa abordagem. (shrink)

Reactive oxygen species (ROS) are highly reactive molecules produced in cells. So far, they have mostly been connected to diseases and pathological conditions. More recent results revealed a somewhat unexpected role of ROS in control of developmental processes. In this review, we elaborate on ROS in development, focussing on their connection to epithelial tissue morphogenesis. After briefly summarising unique characteristics of epithelial cells, we present some characteristic features of ROS species, their production and targets, with a focus on proteins important (...) for epithelial development and function. Finally, we provide examples of regulation of epithelial morphogenesis by ROS, and also of developmental genes that regulate the overall redox status. We conclude by discussing future avenues of research that will further elucidate ROS regulation in epithelial development. (shrink)

Hobbes and Rousseau relied heavily upon the time-worn metaphor of the body politic to describe and explain their respective political visions. But while Rousseau’s use of the metaphor is largely ac...

The principle of homophily says that people associate with other groups of people who are mostly like themselves. Many online communities are structured around groups of socially similar individuals. On Twitter, however, people are exposed to multiple, diverse points of view through the public timeline. The authors captured 30,000 tweets about the shooting of George Tiller, a late-term abortion doctor, and the subsequent conversations among pro-life and pro-choice advocates. They found that replies between like-minded individuals strengthen group identity, whereas replies (...) between different-minded individuals reinforce in-group and out-group affiliation. Their results show that people are exposed to broader viewpoints than they were before but are limited in their ability to engage in meaningful discussion. They conclude with implications for different kinds of social participation on Twitter more generally. (shrink)

To make sense of large data sets, we often look for patterns in how data points are “shaped” in the space of possible measurement outcomes. The emerging field of topological data analysis offers a toolkit for formalizing the process of identifying such shapes. This article aims to discover why and how the resulting analysis should be understood as reflecting significant features of the systems that generated the data. I argue that a particular feature of TDA—its functoriality—is what enables TDA to (...) translate visual intuitions about structure in data into precise, computationally tractable descriptions of real-world systems. (shrink)

Poets are "the institutors of laws, and the founders of civil society, and the inventors of the arts of life, and the teachers who draw into a certain ...

Using results from evolutionary game theory, we analyze the conditions under which guilt can provide individual fitness benefits to actors, and so evolve. In particular, we focus on the individual benefits of guilty apology. We find that guilty apology is more likely to evolve in cases where actors interact repeatedly over long periods of time, where the costs of apology are low or moderate, and where guilt is hard to fake.

This manuscript is intended as a technical supplement to Rosenstock and O'Connor. Calculations are presented for the expected return for strategic players of an iterated prisoner's dilemma which includes guilt-prone grim trigger players, who apologize when they accidentally defect, as well as fake apologizers who in fact act as defectors. See Rosenstock and O'Connor for a discussion of how the results presented here can be interpreted, using ESS analysis and exploring basins of attraction under the replicator dynamics, to help understand (...) the conditions under which guilt can evolve. I hope for this note to both make it easier for others to understand and build on those results, and to demonstrate how expected returns can be calculated for various strategies in various games. (shrink)

The analysis presented here lays out the ethical warrants for requiring community oversight of health research conducted in international settings. It reviews the inadequacies with the current standards of individual informed consent and research ethics committee review, and then, shows how a broader population-based public health perspective raises new demands on justice involving due consideration of the rights, harms and benefits to the community as a whole. As developed here, an ethical standard that requires community oversight of health research is (...) justified on three principled grounds: respect for community autonomy and their right to self-determination; due consideration of the consequences of the research for the community as a whole; and, a more complete understanding of human autonomy. The paper concludes with practical recommendations regarding the composition of Community Advisory Boards to ensure that they have legitimate decision-making authority in diverse socio-cultural contexts. (shrink)

The ubiquity of technology in our lives and its culmination in artificial intelligence raises questions about its role in our moral considerations. In this paper, we address a moral concern in relation to technological systems given their deep integration in our lives. Coeckelbergh develops a social-relational account, suggesting that it can point us toward a dynamic, historicised evaluation of moral concern. While agreeing with Coeckelbergh’s move away from grounding moral concern in the ontological properties of entities, we suggest that it (...) problematically upholds moral relativism. We suggest that the role of power, as described by Arendt and Foucault, is significant in social relations and as curating moral possibilities. This produces a clearer picture of the relations at hand and opens up the possibility that relations may be deemed violent. Violence as such gives us some way of evaluating the morality of a social relation, moving away from Coeckelbergh’s seeming relativism while retaining his emphasis on social–historical moral precedent. (shrink)

Africanisation refers to a renewed focus on Africa, a reclaiming of what has been taken from Africa, and forms part of a post-colonialist and an anti-racist discourse. Africanising the curriculum involves developing scholarship and research established in African intellectual traditions. The idea is that this education will produce people who are not alienated from their communities and are sensitive to the challenges facing Africa. However, the idea of Africanisation is highly contested and may evoke a false or at least a (...) superficial sense of 'belonging,' further marginalisation, or it may emphasise relevance. This article discusses the possibility of Africanisation and takes further the argument of Graham Duncan of how Africans can reclaim their voices in the space of theological education. It unpacks the idea of Africanisation within higher education in general, examining the rationale behind the calls for Africanisation, followed by a discussion on the implications of Africanisation for theological education. (shrink)

Mothers use online resources frequently to obtain information on pregnancy, birth, and parenting. Yet, second-time mothers may have different concerns than first-time mothers given they have a newborn infant and another child at home. The current study conducted an on-line textual analysis of the posts of second-time mothers during pregnancy and the first months postpartum on the BabyCenter LLC website, one of the largest online parenting communities. Latent Dirichlet Allocation analysis on roughly 16,000 posts to BabyCenter birth clubs in 2017 (...) by approximately 4,000 users revealed second-time mothers relied on the online support of the BabyCenter community to share and discuss topics of pregnancy, birth, and child rearing. Second-time mothers also raised questions about preparing their firstborn children for a new baby sibling, how they would care for two children, whether they would love the second one as much as the first, and how the second child would change family dynamics. Future research needs to recognize that second-time mothers may have distinct concerns surrounding the birth of their second baby, and antenatal education and parenting classes may need to be modified to be more inclusive of these women’s needs and perspectives. Online parenting communities offer avenues to support women as they make the transition from one child to two and may provide targeted opportunities to disseminate evidence-based practices that can assist these women and their children. (shrink)

The pastoral role is a significant leadership function within the global evangelical church and is critical to the ongoing health, nurturing and spiritual development of the church and its members. There is limited literature and reflection on hiring for the church, yet the selection of a pastoral leader is more than an employment exercise as it involves important Christian values, perceptions and priorities of the church and the denomination. This article records a study on pastoral hiring process within a significant (...) evangelical denomination in Canada. It uses a descriptive, multiple case-study approach involving four churches engaged in a pastoral search process. Findings revealed a convergence between church practices and typical organisational processes with pragmatic strategies for hiring decisions. In a secularising society of Canada, it is especially important that the church critically reflects on maintaining scriptural values on its hiring practices and not be shaped by the commercially driven business context to distinguish ethical practice and maintain its Christian witness. Contribution: This study provides new knowledge in the field of congregational studies on a much-neglected area of Christian practice, motivating for critical reflection and scriptural integrity within pastoral hiring processes. (shrink)

Comparative study on the fundamentals of Advaita Vedanta and Mādhyamika Buddhism.

This article seeks to present challenges of negotiating difference and diversity in Christiancommunities in South Africa today. It reflects the intersectional nature of racial, gender, ethnicand economic difference, and ways in which land, capital and other power constructs continueto underpin and deepen exclusion. It then considers the status of diversity in Christiancommunities highlighting ways in which the fault lines in society are running throughChristian communities, and how such communities almost spontaneously engage in ‘othering’more naturally than in ‘embracing’. The article proposes (...) the re-conceptualisation of diversitywithin the bigger South African project of socio-economic transformation, and that theconversation about difference and diversity in Christian communities should be brought intodialogue with critical diversity theory, which considers diversity in relation to equity, humanrights and social justice. Finally, the article provides an overview of the contributions that formpart of this collection of articles, tracing how a number of Christian communities seek tonegotiate diversity and difference ecclesially and theologically. (shrink)

The study reports on the results of an empirical investigation of the education and recruitment processes used in HIV vaccine trials conducted in South Africa. Interviews were conducted with 21 key informants involved in HIV vaccine research in South Africa and three focus groups of community advisory board members. Data analysis identified seven major themes on the relationship between education and recruitment: the process of recruitment, the combined dual role of educators and recruiters, conflicts perceived by field staff, pressure to (...) achieve recruitment targets, problems in achieving comprehension, accountability and education as capacity building. The results raise ethical concerns about the adequacy of current informed consent processes in these settings. The study findings bear directly on current debates about issues of exploitation and the scope of moral responsibilities of researchers and funding agencies to assure that HIV clinical prevention research is conducted ethically. (shrink)

Ministerial formation is a multifaceted activity involving critical thinking, the acquisition of knowledge, skills development, religious identity formation and the development of ministerial and spiritual maturity expected of church ministers. Education is not merely the accumulation of a prescribed set of academic credits but includes the holistic formation of all aspects of the individual. However, theological educators are concerned about the capacity to foster such values and skills in the distance and electronic environment. Some see distance education as ‘distancing’ the (...) students in more significant ways than simply geographic distance. These issues are of fundamental importance for they reflect the deeper convictions of theologians that distance education may not be a suitable medium for ministerial formation. This article creates a conceptual map of the theological and pedagogical challenges for ministerial formation and highlights how the possibility of formation is being carried out in the distance-learning environment. (shrink)

BackgroundThe worsening COVID-19 pandemic in South Africa poses multiple challenges for clinical decision making in the context of already-scarce ICU resources. Data from national government and the last published national audit of ICU resources indicate gross shortages. While the Critical Care Society of Southern Africa (CCSSA) guidelines provide a comprehensive guideline for triage in the face of overwhelmed ICU resources, such decisions present massive ethical and moral dilemmas for triage teams. It is therefore important for the health system to provide (...) clinicians and critical care facilities with as much support and resources as possible in the face of impending pandemic demand. Following a discussion of the ethical considerations and potential challenges in applying the CCSSA guidelines, the authors propose a framework for regional triage committees adapted to the South African context.DiscussionBeyond the national CCSSA guidelines, the clinician has many additional ethical and clinical considerations. No single ethical approach to decision-making is sufficient, instead one which considers multiple contextual factors is necessary. Scores such as the Clinical Frailty Score and Sequential Organ Failure Assessment are of limited use in patients with COVID-19. Furthermore, the clinician is fully justified in withdrawing ICU care based on medical futility decisions and to reallocate this resource to a patient with a better prognosis. However, these decisions bear heavy emotional and moral burden compounded by the volume of clinical work and a fear of litigation.ConclusionWe propose the formation of Provincial multi-disciplinary Critical Care Triage Committees to alleviate the emotional, moral and legal burden on individual ICU teams and co-ordinate inter-facility collaboration using an adapted framework. The committee would provide an impartial, broader and ethically-sound viewpoint which has time to consider broader contextual factors such as adjusting rationing criteria according to different levels of pandemic demand and the latest clinical evidence. Their functioning will be strengthened by direct feedback to national level and accountability to a national monitoring committee. The potential applications of these committees are far-reaching and have the potential to enable a more effective COVID-19 health systems response in South Africa. (shrink)

South Africa is a complex society filled with diversity of many kinds. Because of the enormous and profound changes of the last 20 years of democracy, this can be perceived as a society in social identity crisis which is increasingly spilling over into many areas of life. Churches have also gone through a process of reformulating their identity and have restructured theological education for all its members resulting in growing multicultural student bodies. These new student constituencies reflect a wide spectrum (...) of cultural backgrounds, personal histories and theological commitments, and represent diversity in race, ethnicity, culture, class, gender, age, language and sexual orientation. These issues of diversity are theologically complicated and contested as they are attached to religious dogma. Diversity exists as a threat and promise, problem and possibility. Using current conceptualisations of diversity in South African Higher Education this article will seek to understand the notion of diversity and difference and the possibility of developing transformative remedies within the theological education curriculum. (shrink)

What is the role of cultural archives in creating and sustaining connections between diasporic communities? Through an analysis of an audiovisual archive that has sought to bring together representations of and by African, Caribbean and Asian people, this article discusses the relationship between diasporic film, knowledge production and feminist solidarity. Focusing on a self-curated, UK-based archive, the June Givanni Pan-African Cinema Archive, we explore the potentiality of archives for carving out spaces of diasporic connectivity and resistance. This archive assembles the (...) holdings of pan-African films and film-related materials, built over several decades by June Givanni, a Guyanese-born London-based film curator. Givanni’s archive embodies her long relationship with the intersecting worlds of African and Asian diasporic cinema, which hold deep connections to Black British heritage through global networks spanning across empire. In the making of this cultural analysis, we employ a co-produced, decolonial methodological approach by designing and producing the article in collaboration with Givanni over a two-year period. We aim to foreground the role of feminist labour (academic and practitioner) as agents of change who are reclaiming stories, voices and memory-making. The wider backdrop to this co-produced analysis is the ongoing resilience of a cultural amnesia that has pervaded the Black British experience and the current fragility of Black arts and cultural spaces in the UK. Our question is how might archives help us map the connections between racialised ideas of belonging, memory politics and the reconfiguration of colonial power whilst also operating as a site of feminist connectivity? (shrink)

There is a debate regarding the use of the white coat, a traditional symbol of the medical profession, by students. In a study evaluating final-year South African medical students' perceptions, the white coat was associated with traditional symbolic values (e.g., trust) and had practical uses (e.g., identification). The coat was generally perceived to evoke positive emotions in patients, but some recognized that it may cause anxiety or mistrust. Donning a white coat generally implied a responsibility to the profession. For a (...) few, without the coat, patients would not cooperate, resulting in some perceiving no need to be distinguished from qualified practitioners. There was thus some evidence of entitled (vs. earned) respect. In the light of the underresourced health care setting in which these students learn clinical medicine, we recommend that students be able to recognize the potential for unprofessional or unethical behavior. Students should also be able to identify role models. (shrink)

Epidemiological models directly shape policy responses to public health crises. We argue that they also play a less obvious but important role in solving certain coordination problems and social dilemmas that arise during pandemics. This role is both ethically and epistemically valuable. However, it also gives rise to an underappreciated dilemma, as the features that make models good at solving coordination problems are often at odds with the features that make for a good scientific model. We examine and develop this (...) dilemma in the context of the COVID-19 pandemic, and suggest extensions to other domains. (shrink)

The reality of globalisation is that it has knitted the world into a single time and place and has introduced the dominant force of consumerism. In adopting this framework, it has frayed the moral fabric of theological education and has short changed students who are configured as consumers to please rather than characters to build. While the demographic centre of faith has shifted southward, its ways of thinking and engaging culture have not yet caught up with that shift. Global interconnectedness (...) and the globalisation of knowledge together with homogenisation forces have shaped African theological education to the extent that it has absorbed the almost irreversible traits of the West. This paper highlights how transnational cultural forms have profoundly impacted the production of theological education and will attempt a response to the homogenising forces by the focus of African identity. (shrink)

South African churches are struggling to form cohesive communities and strategies are needed to bring people together. Because of a deficiency in trust, people are reluctant to get to know each other, impacting on the quality of relationships and a positive sense of belonging and community. Congregations need to find ways to nurture an inclusive identity instead of the current norm of all-white or all-black churches, which can be perceived as being inaccessible or exclusive. Innovative strategies like storytelling can unlock (...) the power to understand each other breaking down prejudice, racism and xenophobia. Because intercultural socialisation is found wanting in congregations, sharing different perspectives and experiences can deepen engagements overcoming superficial interactions. This article expands on how storytelling can be used to facilitate an inclusive and intercultural congregational identity through identity formation, liberative practices of reconciliation, community building and as an educational resource. (shrink)

Race, ethnicity and national identity are important discussions that are unfinished ecclesial business for churches in South Africa. Churches remain mono-cultural to a large extent; a significant challenge is the fact that churches still largely reflect the social divisions of a society. Although not common in South Africa, there are, at the same time, congregations that are successful at reaching across racial and cultural divides to attract new members and build social capital. This article discusses the reconciliation potential of multicultural (...) churches in that they are able to accommodate multiple racial groups, in a society where religious life remains overwhelmingly segregated. Racial integration is a sensitive issue that has divisive potential and churches and religions in general tend to avoid the issue. Religious communities played a critical role in the transition to democracy; what is needed now is for churches to deepen this reconciliation potential. (shrink)