Crossing Selma\u27s Bridge: Integrating Visual Discovery Strategy and Young Adult Literature to Promote Dialogue and Understanding

Urban communities, separated by race and class, experience a disproportionate number of gun deaths, police shootings, crime, violent and nonviolent protests, as well as disparities in housing, education, and employment. These discussions are visual and textual, appearing in both traditional and social media outlets. How do adolescents read and make sense of these images? We discuss integrating a Social Studies practice, Visual Discovery Strategy, with Young Adult Literature to provide students with the skills to both critique images from the events in their lives and produce responses through both traditional and digital methods

The Banneker History Project: Historic Investigation of a Once Segregated School

The Banneker History Project was a service learning project in which students investigated the history of the Benjamin Banneker School, a segregated school that operated from 1915-1951 in a Midwestern college community. This article discusses the research these students conducted and the perceptions they adopted as a result of their work

Flow energizers. Task A

The effects of a propeller slipstream on the wing laminar boundary are being investigated. Hot-wire velocity sensor measurements have been performed in flight and in a wind tunnel. It is shown that the boundary layer cycles between a laminar state and a turbulent state at the propeller blade passage rate. The cyclic length of the turbulent state increases with decreasing laminar stability. Analyses of the time-varying velocity profiles show the turbulent state to lie in a transition region between fully laminar and fully turbulent. The observed cyclic boundary layer has characteristics similar to relaminarizing flow and laminar flow with external turbulence

Animal carcass processing, cooking and consumption at Early Neolithic Revenia-Korinou, northern Greece

The open-air settlement of Revenia-Korinou has yielded the largest Early Neolithic (7th millennium BC) faunal assemblage to date from Greece. The assemblage, recovered from numerous pits, is heavily dominated by domestic sheep, goats, pigs and cattle. Here we focus on the evidence for butchery and consumption of animals, to explore how carcass products were cooked (in the absence of cooking pots) and what if any role they played in commensal politics. Evidence for dismembering and filleting is sparse, implying butchery of domestic animal carcasses into large segments (including more or less complete limbs) for cooking, apparently in ovens or pits rather than on open fires. Subsequently limb bones were intensively smashed to extract marrow and probably grease, perhaps by boiling in organic containers. Dismembering, filleting and marrow extraction were most intensive for cattle, but bone grease was more systematically exploited in the case of sheep/goats, implying differences between taxa in contexts of consumption. Significant differences between pits in taxonomic composition and the incidence of gnawing and burning suggest that each represents short-term and/or localized discard, perhaps by a small residential group. Within individual pits, matching unfused diaphyses and epiphyses and joins between fragments broken in antiquity confirm rapid burial, but bones separated by dismembering seem to have been dispersed across the settlement before discard. The distribution of carcass products, both cooked and uncooked, played a role in shaping relationships between small residential units and the wider community at Early Neolithic Revenia-Korinou

Tracking a Medically Important Spider: Climate Change, Ecological Niche Modeling, and the Brown Recluse (Loxosceles reclusa)

Most spiders use venom to paralyze their prey and are commonly feared for their potential to cause injury to humans. In North America, one species in particular, Loxosceles reclusa (brown recluse spider, Sicariidae), causes the majority of necrotic wounds induced by the Araneae. However, its distributional limitations are poorly understood and, as a result, medical professionals routinely misdiagnose brown recluse bites outside endemic areas, confusing putative spider bites for other serious conditions. To address the issue of brown recluse distribution, we employ ecological niche modeling to investigate the present and future distributional potential of this species. We delineate range boundaries and demonstrate that under future climate change scenarios, the spider's distribution may expand northward, invading previously unaffected regions of the USA. At present, the spider's range is centered in the USA, from Kansas east to Kentucky and from southern Iowa south to Louisiana. Newly influenced areas may include parts of Nebraska, Minnesota, Wisconsin, Michigan, South Dakota, Ohio, and Pennsylvania. These results illustrate a potential negative consequence of climate change on humans and will aid medical professionals in proper bite identification/treatment, potentially reducing bite misdiagnoses

Stable Isotope Biogeochemistry of Seabird Guano Fertilization: Results from Growth Chamber Studies with Maize (Zea Mays)

Stable isotope analysis is being utilized with increasing regularity to examine a wide range of issues (diet, habitat use, migration) in ecology, geology, archaeology, and related disciplines. A crucial component to these studies is a thorough understanding of the range and causes of baseline isotopic variation, which is relatively poorly understood for nitrogen (δ(15)N). Animal excrement is known to impact plant δ(15)N values, but the effects of seabird guano have not been systematically studied from an agricultural or horticultural standpoint.This paper presents isotopic (δ(13)C and δ(15)N) and vital data for maize (Zea mays) fertilized with Peruvian seabird guano under controlled conditions. The level of (15)N enrichment in fertilized plants is very large, with δ(15)N values ranging between 25.5 and 44.7‰ depending on the tissue and amount of fertilizer applied; comparatively, control plant δ(15)N values ranged between -0.3 and 5.7‰. Intraplant and temporal variability in δ(15)N values were large, particularly for the guano-fertilized plants, which can be attributed to changes in the availability of guano-derived N over time, and the reliance of stored vs. absorbed N. Plant δ(13)C values were not significantly impacted by guano fertilization. High concentrations of seabird guano inhibited maize germination and maize growth. Moreover, high levels of seabird guano greatly impacted the N metabolism of the plants, resulting in significantly higher tissue N content, particularly in the stalk.The results presented in this study demonstrate the very large impact of seabird guano on maize δ(15)N values. The use of seabird guano as a fertilizer can thus be traced using stable isotope analysis in food chemistry applications (certification of organic inputs). Furthermore, the fertilization of maize with seabird guano creates an isotopic signature very similar to a high-trophic level marine resource, which must be considered when interpreting isotopic data from archaeological material