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Until now, archaeological and historical studies of Mesoamerican plazas have been scarce compared to studies of the surrounding monumental architecture such as pyramidal temples and palaces. Many scholars have assumed that ancient Mesoamericans invested their labor, wealth, and symbolic value in pyramids and other prominent buildings, viewing plazas as by-products of these buildings. Even when researchers have recognized the potential significance of plazas, they have thought that plazas as vacant spaces could offer few clues about their cultural and political roles.Mesoamerican Plazaschallenges both of these assumptions.The primary question that has motivated the contributors is how Mesoamerican plazas became arenas for the creation and negotiation of social relations and values in a community. The thirteen contributions stress the significance of interplay between power relations and embodied practices set in specific historical and material settings, as outlined by practice theory and performance theory. This approach allows the contributors to explore broader anthropological issues, such as the negotiation of power relations, community making, and the constitution of political authorities.Overall, the contributions establish that physical interactions among people in communal events were not the outcomes of political machinations held behind the scenes, but were the actual political processes through which people created, negotiated, and subverted social realities. If so, spacious plazas that were arguably designed for interactions among a large number of individuals must have also provided critical arenas for the constitution and transformation of society.

The plaza has been a defining feature of Mexican urban architecture and culture for at least 4,000 years. Ancient Mesoamericans conducted most of their communal life in outdoor public spaces, and today the plaza is still the public living room in every Mexican neighborhood, town, and city-the place where friends meet, news is shared, and personal and communal rituals and celebrations happen. The site of a community's most important architecture-church, government buildings, and marketplace-the plaza is both sacred and secular space and thus the very heart of the community. This extensively illustrated book traces the evolution of the Mexican plaza from Mesoamerican sacred space to modern public gathering place. The authors led teams of volunteers who measured and documented nearly one hundred traditional Mexican town centers. The resulting plans reveal the layers of Mesoamerican and European history that underlie the contemporary plaza. The authors describe how Mesoamericans designed their ceremonial centers as embodiments of creation myths-the plaza as the primordial sea from which the earth emerged. They discuss how Europeans, even though they sought to eradicate native culture, actually preserved it as they overlaid the Mesoamerican sacred plaza with the Renaissance urban concept of an orthogonal grid with a central open space. The authors also show how the plaza's historic, architectural, social, and economic qualities can contribute to mainstream urban design and architecture today.

The streets of Roman cities have received surprisingly little attention until recently. Traditionally the main interest archaeologists and classicists had in streets was in tracing the origins and development of the orthogonal layout used in Roman colonial cities. Roman Urban Street Networks is the first volume to sift through the ancient literature to determine how authors used the Latin vocabulary for streets, and determine what that tells us about how the Romans perceived their streets. Author Alan Kaiser offers a methodology for describing the role of a street within the broader urban transportation network in such a way that one can compare both individual streets and street networks from one site to another. This work is more than simply an exploration of Roman urban streets, however. It addresses one of the central problems in current scholarship on Roman urbanism: Kaiser suggests that streets provided the organizing principle for ancient Roman cities, offering an exciting new way of describing and comparing Roman street networks. This book will certainly lead to an expanded discussion of approaches to and understandings of Roman streetscapes and urbanism.

This article reinvestigates the relationship between real per capita gross domestic product (GDP) and terrorism. We devise a terrorism Lorenz curve to show that domestic and transnational terrorist attacks are each more concentrated in middle-income countries, thereby suggesting a nonlinear income–terrorism relationship. Moreover, this point of concentration shifted to lower income countries after the rising influence of the religious fundamentalist and nationalist/separatist terrorists in the early 1990s. For transnational terrorist attacks, this shift characterized not only the attack venue but also the perpetrators' nationality. The article then uses nonlinear smooth transition regressions to establish the relationship between real per capita GDP and terrorism for eight alternative terrorism samples, accounting for venue, perpetrators' nationality, terrorism type, and the period. Our nonlinear estimates are shown to be favored over estimates using linear or quadratic income determinants of terrorism. These nonlinear estimates are robust to additional controls.

All humans share a universal, evolutionarily ancient approximate number system (ANS) that estimates and combines the numbers of objects in sets with ratio-limited precision. Interindividual variability in the acuity of the ANS correlates with mathematical achievement, but the causes of this correlation have never been established. We acquired psychophysical measures of ANS acuity in child and adult members of an indigene group in the Amazon, the Mundurucú, who have a very restricted numerical lexicon and highly variable access to mathematics education. By comparing Mundurucú subjects with and without access to schooling, we found that education significantly enhances the acuity with which sets of concrete objects are estimated. These results indicate that culture and education have an important effect on basic number perception. We hypothesize that symbolic and nonsymbolic numerical thinking mutually enhance one another over the course of mathematics instruction.

In this article, we present the results of an 11-month longitudinal study (beginning when children were 6 years old) focusing on measures of the approximate number sense (ANS) and knowledge of the Arabic numeral system as possible influences on the development of arithmetic skills. Multiple measures of symbolic and nonsymbolic magnitude judgment were shown to define a unitary factor that appears to index the efficiency of an ANS system, which is a strong longitudinal correlate of arithmetic skills. However, path models revealed that knowledge of Arabic numerals at 6 years was a powerful longitudinal predictor of the growth in arithmetic skills, whereas variations in magnitude-comparison ability played no additional role in predicting variations in arithmetic skills. These results suggest that verbal processes concerned with learning the labels for Arabic numerals, and the ability to translate between Arabic numerals and verbal codes, place critical constraints on arithmetic development.

The relationship between green and grey urban infrastructure, local meteorological conditions, and traffic-related air pollution is complex and dynamic. This case study examined the effect of evolving morphologies around a city square park in Dublin and explores the twin impacts of local urban development (grey) and maturing parks (green) on particulate matter (PM) pollution. A fixed air quality monitoring campaign and computational fluid dynamic modelling (ENVI-met) were used to assess current (baseline) and future scenarios. The baseline results presented the distribution of PM in the study area, with bimodal (PM 2.5 ) and unimodal (PM 10 ) diurnal profiles. The optimal vegetation height for air quality within the park also differed by wind direction with 21 m vegetation optimal for parallel winds (10.45% reduction) and 7 m vegetation optimal for perpendicular winds (30.36% reduction). Increased building heights led to higher PM 2.5 concentrations on both footpaths ranging from 25.3 to 37.0% under perpendicular winds, whilst increasing the height of leeward buildings increased PM 2.5 concentrations by up to 30.9% under parallel winds. The findings from this study provide evidence of the importance of more in-depth analysis of green and grey urban infrastructure in the urban planning decision-making process to avoid deteriorating air quality conditions around city square parks.

Although empirical research has generally demonstrated that democracies experience more terrorism than autocracies, research suggests that this depends upon complex institutional differences that go beyond the democracy-autocracy divide. This study examines these differences, linking institutions to strategies of coercion and co-optation. Using zero-inflated negative binomial regression estimations on Geddes' (2003) autocratic regime-type data for 161 countries between 1970 and 2006, we find that single-party authoritarian regimes consistently experience less domestic and international terrorism relative to military autocracies and democracies. This finding is robust to a large number of specifications, underscoring the explanatory power of regime type for predicting terrorism. Our explanation for these findings is that party-based autocracies have a wider range of coercion and co-option strategies that they can employ to address grievance and dissent than do other, more strategically restricted, regimes.

The spread of plaza-pyramid complexes across southern Mesoamerica during the early Middle Preclassic period (1000 to 700 BCE) provides critical information regarding the origins of lowland Maya civilization and the role of the Gulf Coast Olmec. Recent excavations at the Maya site of Ceibal, Guatemala, documented the growth of a formal ceremonial space into a plaza-pyramid complex that predated comparable buildings at other lowland Maya sites and major occupations at the Olmec center of La Venta. The development of lowland Maya civilization did not result from one-directional influence from La Venta, but from interregional interactions, involving groups in the southwestern Maya lowlands, Chiapas, the Pacific Coast, and the southern Gulf Coast.