Investigating the potential of micro-focus computed tomography in the study of ancient bone tool function: results from actualistic experiments

Many experiments have sought to recreate the types of damage that would be expected in ancient stone and bone weapon tips. This damage is usually presented as visible fractures or microscopic surface modification. Fatigue tests conducted on bovine bones, however, show the development of internal micro-cracks that result from stress, prior to actual breakage. In this paper I present the results of an experimental investigation of bone points subjected to a variety of activities. I assess the presence of microdamage using micro-focus computed tomography. The results show that two patterns of micro-cracks develop in bone and are best viewed in longitudinal section. Micro-cracks are a cumulative feature dependent on the amount of load applied and the duration of activity. When subjected to high enough loading rates, micro-cracks will merge together to eventually form a fracture. Although further tests are needed to confirm the exact point at which these fatigue fractures begin to form, micro-focus computed tomography has the potential to reveal whether an individual bone point underwent multiple or prolonged impacts and thus to elucidate the probable function/s of ancient pointed bone tools where no visible damage is apparent. Micro-focus computed tomography is a non-destructive and non-invasive procedure and therefore safe to use on archaeological artefacts.     

Other People’s Data: A Demonstration of the Imperative of Publishing Primary Data

This study explores issues in using data generated by other analysts. Three researchers independently analyzed an orphaned, decades-old zooarchaeological dataset and then compared their analytical approaches and results. Although they took a similar initial approach to determine the dataset’s suitability for analysis, the three researchers generated markedly different interpretive conclusions. In examining how researchers use legacy data, this paper highlights interpretive issues, data integrity concerns, and data documentation needs. In order to meet these needs, we propose greater professional recognition for data dissemination, favoring models of “data publication” over “data sharing” or “data archiving.”     

Book Reviews

Abstract

The coordinated behavior of members of a state delegation to the U.S. Senate can provide constituents in a state greater representation in Congress. Despite this potentially improved level of representation through coordination, popular and scholarly accounts of the U.S. Senate often feature senators from the same state at odds with one another on a variety of policy issues. In this research, we investigate competing expectations regarding the frequency (across topics) of collaborations between members of a state delegation to the Senate. We then test our expectations using patterns in bill cosponsorship in the 103rd–110th U.S. Senates. We find that senators from the same state work together often on the development of legislation, and that this coordinated activity is consistent across a variety of bill topics across many sessions of congressional activity. Notably, same-state status is an even stronger predictor of support via cosponsorship than is same-party status, raising possible avenues of breaking through partisan gridlock.     

Aboriginal reconciliation as religious politics: Secularisation in Australia

The characterisation of the Australian polity as a strikingly ‘secular’ polity is in certain respects misleading. Australian political debate continues to be marked by a religious element. For example, the language of Aboriginal ‘reconciliation’ had several distinctly Christian resonances and ambiguities, including the difficult relation of justice and forgiveness. This paper considers the Aboriginal reconciliation process in the light of three different ideas of secularism: secularism as a doctrine of the two ends of humanity; secularisation as disenchantment or rationalisation; and secularisation as the transposition of theology into a mundane or earthly idiom.     

Population Synthesis: Comparing the Major Techniques Using a Small, Complete Population of Firms

Recently, disaggregate modeling efforts that rely on microdata have received wide attention by scholars and practitioners. Synthetic population techniques have been devised and are used as a viable alternative to the collection of microdata that normally are inaccessible because of confidentiality concerns or incomplete because of high acquisition costs. The two most widely discussed synthetic techniques are the synthetic reconstruction method (IPFSR), which makes use of iterative proportional fitting (IPF) techniques, and the combinatorial optimization (CO) method. Both methods are described in this article and then evaluated in terms of their ability to recreate a known population of firms, using limited data extracted from the parent population of the firms. Testing a synthetic population against a known population is seldom done, because obtaining an entire population usually is too difficult. The case presented here uses a small, complete population of firms for the City of Hamilton, Ontario, for the year 1990; firm attributes compiled are number of employees, 3-digit standard industrial classification, and geographic location. Results are summarized for experiments based upon various combinations of sample size and tabulation detail designed to maximize the accuracy of resulting synthetic populations while holding input data costs to a minimum. The output from both methods indicates that increases in sample size and tabulation detail result in higher quality synthetic populations, although the quality of the generated population is more sensitive to increases in tabular detail. Finally, most tests conducted with the created synthetic populations suggest that the CO method is superior to the IPFSR method.     

Bridging East and West: Muslim-identified activists and organisations in the UK anti-war movements

Divisive Orientalist discourses and practices, mobilised in the 'war on terror', have been resisted through collaborative political projects designed to contest and close gaps between East and West, Muslim and non-Muslim. Through interviews with Muslim-identified and other British anti-war activists, this paper traces the making of a 'new bridge between the East and the West'. It then goes on to examine the limitations of this political model and describe the search for political relationships that would mobilise Muslim identities in more subtle ways and speak past rather than against contemporary Orientalism.     

Hunting with Howiesons Poort segments: pilot experimental study and the functional interpretation of archaeological tools

For many decades the use of backed pieces from the Howiesons Poort, between about 70 ka and 55 ka ago, in South Africa has been a point of discussion. Recently direct evidence has been provided to associate these tools with Middle Stone Age hunting strategies. Yet, whether they were used to tip hunting weapons or as barbs remained an open question. In this paper we introduce a set of pilot experiments designed to test the effectiveness of Howiesons Poort segments, the type fossils of the industry, hafted in four different configurations as tips for hunting weapons. It is shown that the morphological type can be used successfully in this way. We present the results of a macrofracture analysis conducted on the experimental tools and compare these to results obtained from three Howiesons Poort backed tool samples. By correlating experimental outcomes, macrofracture data and the interpretation of micro-residue distribution patterns, we provide some insight into the functional variables that might be associated with Howiesons Poort segments.     

The Human Role in Earth Surface Systems: Some Theoretical Considerations

Studies of human influences on the environment may treat human agency as an imposed, exogenous source of change or disturbance, or as an intrinsic part of earth surface systems. Consideration of human influences as exogenous or endogenous to earth surface systems can affect, or even predetermine, the outcome of analyses. This is demonstrated via qualitative stability analyses of generalized mass-and-energy-flux systems. When human impacts are considered as external disturbances such systems are stable, and will regain equilibrium after changes or perturbations. Conversely, when human impacts are included as a system component, with goals of either maximizing or minimizing throughput of mass and energy, the system is inherently unstable.