Refining the Quadratic Crown Height Method of age estimation: do elk teeth wear quadratically with age?

Teeth are the basis for the best methods for estimating the age-at-death of archaeological and paleontological faunal remains, because they change by eruption and wear throughout an individual's life and because they preserve well. However, age-at-death can be difficult to estimate when teeth are isolated or when no known-age reference sample is available. For these reasons, researchers developed the Quadratic Crown Height Method (QCHM), a set of quadratic formulae that can be used to predict age-at-death from tooth crown height, when unworn crown height and the ages when the tooth erupts and when its crown height should reach zero can be estimated. Previous tests of the QCHM suggest that modified equations could improve the method. Here, we use crown height measurements on a sample of 226 known-age Rocky Mountain elk (Cervus elaphus) to perform such modifications. We adjust the age at which each tooth type's crown height reaches zero from the species' potential ecological longevity or average maximum life span to an age that we empirically estimate for each tooth type. We also empirically assess whether for different elk teeth the exponent in the QCHM formula is actually equal to 2; it is for M1, but for P4 it is about 1, indicating a roughly linear relationship. The exponents for M2 and M3 are intermediate, being closer to 1.5. Because different teeth wear at different rates and wear completely away at different ages, we recommend that researchers use the modified equations provided here to estimate age-at-death for samples of Cervus elaphus.     

Constructions of cosmopolitanism in teenage citizenship in Singapore

This study aims to uncover the geographies of places informing teenagers' understanding of cosmopolitanism and citizenship. Children and young people (CYP) in Singapore are becoming more internationally mobile and growing up in highly globalised Singapore. There are three overall arguments in this paper. First, the local is the actual place to situate studies on cosmopolitanism and that cosmopolitanism should be considered as a dimension of deterritorialised citizenship amongst CYP growing up in highly globalised nation-states. There are ‘roots and routes’ approaches to citizenship and my second argument is that the ‘routes approach’ to citizenship has ingrained cosmopolitan experiences into young people's life-worlds and is arguably the stronger approach of the two for young Singaporeans. Finally, this study demonstrates that the experiences of CYP in geographies of education [Holloway, S. L., P. Hubbard, H. Jöns, H. Pimlott-Wilson. 2010. “Geographies of Education and the Significance of Children, Youth and Families.” Progress in Human Geography 34 (5)] are credible yet neglected life-worlds that can help reconstitute frameworks for understanding cosmopolitanism and citizenship [Harvey, D. 2000. “Cosmopolitanism and the Banality of Geographical Evils.” Public Culture 12 (2)].     

AMS C dating of early human occupation of southern South America

The time of appearance of a persistent and demographically-viable hunter-gatherer population in late Pleistocene southern South America must be determined by evaluating evidence from as large as possible a sample of candidate archaeological sites in the region. We co-ordinated the AMS dating of multiple bone and charcoal samples from previously-excavated strata at the following sites: Arroyo Seco 2, Paso Otero 5, Piedra Museo, and Cueva Tres Tetas (all in Argentina), and Cueva del Lago Sofia 1 and Tres Arroyos (both in Chile). With one possible exception, we did not obtain new results to confirm earlier observations of pre-Clovis-age cultural activity at any of the sites considered in this study. The possible exception, Arroyo Seco 2, is considered in detail elsewhere [Politis G., Gutierrez M.A., Scabuzzo, C. (Eds), in press. Estado actual de las Investigaciones en el sitio 2 de Arroyo Seco (región pampeana, Argentina). Serie Monográfica INCUAPA 5. Olavarría]. However, our results for the samples which were the most preferred indicators of cultural events (hearth charcoal and cut-marked bone) confirm that people were in the southern cone of South America at or soon after 11,000 BP (13,000 cal BP). Considered alongside recent age estimates for the Clovis culture in North America, these results imply the contemporaneous emergence of a consistent and archaeologically-robust human occupation signal at widely-separated locations across the Western Hemisphere. Such findings suggest that Palaeoindian demic expansion may have involved more than one terminal Pleistocene dispersal episode.     

Virtual skeletons: using a structured light scanner to create a 3D faunal comparative collection

Appropriate comparative animal skeletons are not always available to faunal analysts for use in identifying archaeofaunal remains. This is especially pertinent when working in locations where no comparative collections are available locally, and the archaeological assemblage cannot be transported to another facility. In order to fill this gap, we are building a virtual comparative faunal collection using a structured light scanner to scan modern skeletal material in 3D. The resulting high resolution 3D color models are a valuable resource for identifying fossil specimens. Scan data can be converted into a variety of formats for viewing and can be transported on a portable digital device for use at field or laboratory localities. In addition, scans can be printed three dimensionally to produce a replica of the scanned skeletal part. A particular advantage of this digital technology is that we can eventually create a complete 3D representation of a taxon's skeleton from scans of several components of what are incomplete skeletons of one animal taxon in a museum collection. The results of our project thus far are available to other researchers and educators by means of the internet. A variety of interested parties could benefit from such a collection, including zooarchaeologists, paleontologists, biologists, teachers and museum curators.     

Effect of salinity on mass and energy transport by hydrothermal fluids based on the physical and thermodynamic properties of H2O‐NaCl

Various thermodynamic properties of H₂O that are defined as pressure or temperature derivatives of some other variable, such as isothermal compressibility (β, pressure derivative of density), isobaric thermal expansion (α, temperature derivative of density), and specific isobaric heat capacity (c_f, temperature derivative of enthalpy), all show large magnitudes near the critical point, reflecting large variations in fluid density and specific enthalpy with small changes in temperature and pressure. As a result, mass (related to fluid density) and energy (related to fluid enthalpy) transport in this PT region are sensitive to changing PT conditions. Addition of NaCl to H₂O causes the region of anomalous behavior, here defined as the critical region, to migrate to higher temperatures and pressures. The critical region is defined as that region of PT space in which the dimensionless reduced susceptibility  ≥ 0.5. When NaCl is added to H₂O, the critical region migrates to higher temperature and pressure. However, the absolute magnitudes of thermodynamic properties that are defined as temperature and/or pressure derivatives (α, β, and c_f) all decrease with increasing salinity. Thus, the mass and energy transporting capacities of hydrothermal fluids in the critical region become less sensitive to changing PT conditions as the salinity increases. For example, quartz solubility can be described as a function of fluid density, and because density becomes less sensitive to changing PT conditions as salinity increases, quartz solubility also becomes less sensitive to changing PT conditions as fluid salinity increases. Similarly, fluxibility describes the ability of a fluid to transport heat by buoyancy‐driven convection, and fluxibility decreases with increasing salinity. Results of this study show that the mass and energy transport capacity of fluids in the Earth's crust are maximized in the critical region and that the sensitivity to changing PT conditions decreases with increasing salinity.     

Global Society and Its Ancient Greek Antecedents

Can a democratic Global Society become the alternative to Empire and bring order into present international anarchy? One hundred percent sovereignty in nation states gives “security” to each but creates “anarchy” in relations between states. To bring order into international relations some sovereignty has to be surrendered. Empire, which does bring an order of sorts, is imposed from outside, is undemocratic and aggrandising. Global Society can be conceptualised as its alternative. Sharply contrasting Global Society to Empire tends to pose the former as a panacea, but it is important to know its potential faults. Global Society can be envisioned at the constitutive stage and as continuing to exert influence within the institutions it creates. At the difficult constitutive stage, it will be fragile and of unwieldy size and ought only be called into play at critical junctures. The institutions it creates will be a democratic federal regime of regional blocks of states. To resolve issues, Global Society presumes effective consocial dialogue and participation rather than violent contention. Classical and Hellenistic Greece provide examples where vision and honour battled with the ambitions and greed of Empire and remarkably sometimes won. All the Greek city-states were under some sort of regional federal alliance at different times and drew strength from shared religious sanctuaries and their attached Games. The various interchanges between democratic Federalism and Empire in ancient Greece offers a microcosm of today's interregnum between modern and postmodern international relations.

For as democratic political theorists at the start of the twenty first century, we do not seem to be able to do without the legitimizing idea of the People, but we do not know what to do with it.

—Margaret Canovan, “The People, the Masses, and the Mobilization of Power: The Paradox of Hannah Arendt's ‘Populism’”     

Social Networks and Policy Entrepreneurship: How Relationships Shape Municipal Decision Making about High‐Volume Hydraulic Fracturing

Well‐resourced and well‐connected individuals, or “policy entrepreneurs,” often play an important role in advocating and securing the adoption of policies. There is a striking lack of inquiry into the ways that social networks shape the ability of these actors to achieve their aims, including the ways in which network ties may channel policy conflict. To address these gaps, we analyze data from an original survey and an original database of policies to assess the success of policy entrepreneurs (PEs) active in a highly contentious arena: municipal policymaking concerning high‐volume hydraulic fracturing (HVHF) in New York. We use text‐mining to collect social network data from local newspaper archives, then use those data to construct municipal HVHF policy networks. Municipal anti‐HVHF PEs appear more successful when they operate in less cohesive networks, act as bridges to relative newcomers to the governance network, and have a larger number of network connections. Pro‐HVHF PEs appear more successful when they can forge high‐value connections to key decision makers. Policy entrepreneurs on both sides of the issue are more successful when they have a greater number of sympathetic coalition partners.     

Directional asymmetry in the human clavicle

The human right clavicle tends to be shorter than the left. A range of possible explanations can be advanced to account for this asymmetry. In the present work, clavicular morphology was studied in a medieval skeletal assemblage from Wharram Percy, England, with the aim of evaluating these competing explanations. At Wharram Percy, as anticipated, the right clavicle tended to be shorter. Patterns of asymmetry in curvature, robusticity, vascularization, and in the morphology of ligament and muscle attachment sites were also studied. The patterning in these data at Wharram Percy is consistent with inhibition of longitudinal growth of the clavicle on the dominant side due to lateral bias in mechanical loading, particularly in axial compression. Copyright © 1999 John Wiley & Sons, Ltd.