The intensification of agriculture as farming communities grew in size did not always produce a successful and sustainable economic base. At Ras an-Numayra on the Dead Sea Plain, a small farming community of the late fourth millennium BC developed a specialised plant economy dependent on cereals, grapes and flax. Irrigation in this arid environment led to increased soil salinity while recurrent cultivation of flax may have introduced the fungal pathogen responsible for flax wilt. Faced with declining yields, the farmers may have further intensified their irrigation and cultivation schedules, only to exacerbate the underlying problems. Thus specialised crop production increased both agricultural risk and vulnerability to catastrophe, and Ras an-Numayra, unlike other sites in the region, was abandoned after a relatively short occupation.

The origin and development of wheeled vehicles continues to fascinate today no less than when Stuart Piggott (1974) first wrote about the subject in Antiquity 40 years ago. A growing number of examples from the steppes of southern Russia and Ukraine are providing new insights into the design and construction of these complex artefacts. A recent example from the Ulan IV burial mound illustrates the techniques employed and the mastery of materials, with careful selection of the kinds of wood used for the wheels, axles and other elements. Stable isotope analysis of the individual interred in this grave showed that he had travelled widely, emphasising the mobility of steppe populations.

Recent excavations at La Bastida in south-eastern Spain have revealed an impressive stone-built fortification system dating to 2200–2100 cal BC that protected one of the main economic and political centres of Argaric Early Bronze Age society. It consists of parallel walls with projecting towers flanking a narrow entrance passage. The defensive character of these structures appears beyond question and their design suggests they were a response to significant changes in warfare and weaponry in this period. This sophisticated fortification system raises once again the question of possible Mediterranean contacts, along with social change and the role of physical violence in the rise of Argaric society.

The polished stone objects known as ‘wrist-guards’ found in Early Bronze Age graves in Britain and Continental Europe have proved difficult to interpret. Are they connected with archery, as has long been supposed, or were they instead associated with falconry? Using trained birds of prey for hunting is an elite practice in many historical and ethnographic contexts, and would be consistent with the appearance of exotic materials in these graves. Detailed consideration of the wrist-guards and associated objects from a falconer's perspective, however, demonstrates that the argument is unconvincing.

When fire swept through a workshop at Ambelikou Aletri on Cyprus in the nineteenth or twentieth century BC it brought a sudden halt to pottery production, leaving the latest batch of recently fired vessels. The remains of the kiln and its immediate surroundings provide a rare opportunity to gain direct insight into the technology and organisation of a Middle Bronze Age pottery workshop in the eastern Mediterranean. Analysis of the batch of cutaway-mouthed jugs adjacent to the kiln reveals a level of standardisation focused more on vessel shape than capacity, and shows that at a detailed level, no two jugs were alike. This pottery production site provides vital background for the study of contemporary pottery assemblages on Cyprus and elsewhere in the broader region.

Pottery has sometimes been compared to a living organism in its cycle of birth, life and death or discard. A biographical approach to an unusual assemblage of pottery from the Late Bronze Age site of Pico Castro in central Spain suggests that they had been used together at a communal feast. The shared social memory that they acquired thereby conferred on them a special status that resulted in their eventual placement in the pit, fine wares and coarse wares together. Thus the varied biographies of the individual vessels—and the individual sherds—eventually converged not only in their discard but in the episodes that preceded it.

The lake-dwellings of the Circum-Alpine region have long been a rich source of detailed information about daily life in Bronze Age Europe, but their location made them vulnerable to changes in climate and lake level. At several Late Bronze Age examples, skulls of children were found at the edge of the lake settlement, close to the encircling palisade. Several of the children had suffered violent deaths, through blows to the head from axes or blunt instruments. They do not appear to have been human sacrifices, but the skulls may nonetheless have been offerings to the gods by communities faced with the threat of environmental change.

The Lapita expansion took Austronesian seafaring peoples with distinctive pottery eastward from the Bismarck Archipelago to western Polynesia during the late second millennium BC, marking the first stage in the settlement of Oceania. Here it is shown that a parallel process also carried Lapita pottery and people many hundreds of kilometres westward along the southern shore of Papua New Guinea. The key site is Hopo, now 4.5km inland owing to the progradation of coastal sand dunes, but originally on the sea edge. Pottery and radiocarbon dates indicate Lapita settlement in this location c. 600 BC, and suggest that the long-distance maritime networks linking the entire southern coast of Papua New Guinea in historical times may trace their origin to this period.

The discovery of an iron pin in place of an upper incisor tooth from a La Tène burial at Le Chêne in northern France may represent one of the earliest examples of a dental implant in Western Europe. The body was that of a young woman who had been buried in a richly furnished timber chamber. The iron pin may have been inserted during life to replace a lost tooth, or before burial to restore the visual integrity of the corpse. The concept of the dental prosthesis may have been taken from the Etruscans by returning Celtic mercenaries, although dental implants of this specific kind have not been found in Etruscan contexts.

When and how did urban life in Roman Britain end? The excavations conducted by Philip Barker at Wroxeter from 1966–1990 produced evidence suggesting a post-Roman phase of urban activity that continued into the sixth or seventh century AD, up to 200 years beyond the traditionally accepted chronology. Careful re-examination of the evidence, however, throws doubt on these claims. More recent work on Late Roman Britain coupled with new discoveries in Wales and the west challenges the evidence for the post-Roman survival of Wroxeter as an urban centre and suggests that it may have been largely abandoned, along with other Roman towns, in the late fourth or early fifth century AD.

The growth of medieval cities in Northern Europe placed new demands on food supply, and led to the import of fish from increasingly distant fishing grounds. Quantitative analysis of cod remains from London provides revealing insight into the changing patterns of supply that can be related to known historical events and circumstances. In particular it identifies a marked increase in imported cod from the thirteenth century AD. That trend continued into the fifteenth and sixteenth centuries, after a short downturn, perhaps attributable to the impact of the Black Death, in the mid fourteenth century. The detailed pattern of fluctuating abundance illustrates the potential of archaeological information that is now available from the high-quality urban excavations conducted in London and similar centres during recent decades.

Raised field agriculture in the Basin of Mexico was a highly sustainable farming method that did not depend upon centralised political control. Study of the chinampa system around the Early and Middle Postclassic city of Xaltocan through a combination of remote sensing, GIS, targeted excavation and AMS dating has revealed an extensive area of raised fields that was abandoned when Xaltocan was conquered by an alliance of powerful neighbours during the fourteenth century AD. The rise and abandonment of the chinampa system were thus directly linked to the political economy of the city-state. The failure to revive the raised field systems in the following Aztec period can also be attributed to the impact of political, economic and ecological factors.

The temple of Angkor Wat in Cambodia is one of the most famous monuments in the world and is noted for its spectacular bas-relief friezes depicting ceremonial and religious scenes. Recent work reported here has identified an entirely new series of images consisting of paintings of boats, animals, deities and buildings. Difficult to see with the naked eye, these can be enhanced by digital photography and decorrelation stretch analysis, a technique recently used with great success in rock art studies. The paintings found at Angkor Wat seem to belong to a specific phase of the temple's history in the sixteenth century AD when it was converted from a Vishnavaite Hindu use to Theravada Buddhist.

Bayesian analysis has come to be widely used in archaeological chronologies and has been a regular feature of recent articles in Antiquity. Its application to linguistic prehistory, however, has proved controversial, in particular on the issue of Indo-European origins. Dating and mapping language distributions back into prehistory has an inevitable fascination, but has remained fraught with difficulty. This review of recent studies highlights the potential of increasingly sophisticated Bayesian phylogenetic models, while also identifying areas of concern, and ways in which the models might be refined to address them. Notwithstanding these remaining limitations, in the Indo-European case the results from Bayesian phylogenetics continue to reinforce the argument for an Anatolian rather than a Steppe origin.

Geophysical techniques now available to archaeology have the potential to provide large-scale survey data that can map the buried structures of extensive and complex sites. Recent work at two Late Bronze Age hilltop fortresses in the mountainous volcanic terrain of Armenia provides an excellent illustration of their potential. Magnetometry revealed an unknown residential complex at Tsaghkahovit. Across the plain at Gegharot, where magnetometry was less successful, ground-penetrating radar identified terracing extending down the western slope of the hill below the fortress, greatly increasing the size of the occupied area. Combined with targeted excavations, these geophysical approaches are providing novel insights into the unusual political relations between fortress-based sovereigns and mobile subjects in central Armenia.

New methods of visualisation offer the potential for a more detailed record of archaeological objects and the ability to create virtual 3D models that can be made widely available online. Here, two different techniques are applied to the impressive Easter Island statue on display in the Wellcome Gallery at the British Museum. Of particular importance are the details revealed of the petroglyphs that decorate its surface.

The recent proposal that North America was first settled by Upper Palaeolithic people from Europe who crossed the Atlantic along the edge of the Arctic ice sheet has generated considerable controversy. Here Michael O'Brien and colleagues challenge the evidence that has been presented in support of that hypothesis. There follows a response by Dennis Stanford and Bruce Bradley, and a closing reply from O'Brien et al.

Across Atlantic ice: the origin of America's Clovis culture (Stanford & Bradley 2012) is the latest iteration of a controversial proposal that North America was first colonised by people from Europe rather than from East Asia, as most researchers accept. The authors, Dennis Stanford and Bruce Bradley, argue that Solutrean groups from southern France and the Iberian Peninsula used watercraft to make their way across the North Atlantic and into North America during the Last Glacial Maximum (LGM). According to Stanford and Bradley, this 6000km journey was facilitated by a continuous ice shelf that provided fresh water and a food supply. Across Atlantic ice has received a number of positive reviews. Shea (2012: 294), for example, suggests that it is “an excellent example of hypothesis-building in the best tradition of processual archaeology. It challenges American archaeology in a way that will require serious research by its opponents”. Runnels (2012) is equally enthusiastic.

Across Atlantic ice (AAI) sets out specifically to propose an alternative hypothesis of early human entry into the Americas and to stimulate research (Stanford & Bradley 2012: 16). O'Brien et al.'s response (above) primarily contains an unsupported dismissal of the evidence and these ideas. Unfortunately, to date, no work equivalent to AAI has been presented for any other Clovis origin hypothesis; this would be most welcome, especially from those who critique and reject the Solutrean hypothesis with unsupported assertions.

For convenience we respond to each of O'Brien et al.'s critiques in the order in which they appear.