Archaeologists of East and southern Africa have long been attracted to large urban centres, such as those on the Swahili coast, and to the circulation of imported goods. Here, the authors aim to refocus attention on the diversity of objects that were produced and transformed by the inland societies of East and southern Africa during the Middle Iron Age (AD 750–1250). Recognition of the remaking, bundling and repurposing of small, portable objects emphasises the innovative practices that helped to bestow power on their makers. A socially embedded approach to studying objects and practices re-presents African communities as innovators and active transformers of non-local objects, and facilitates new narratives about the political economy of Africa at that time.

The area of the Atures Rapids in the Middle Orinoco River (Venezuela), where multiple Indigenous communities gathered to trade goods, has been identified as a prominent center of commerce since early colonial times. However, the exchange activities taking place there between local and nonlocal actors before European colonization are poorly understood, based only on the ethnohistoric record. This article presents an archaeometric analysis of stone beads and ceramic roller stamps, items previously associated with trade practices, from two recently excavated sites in the region, Picure (AD 1030–1480) and Rabo de Cochino (AD 1000–1440); it assesses their provenance, production, and value. We propose that Picure was a site of a bead-manufacturing workshop and a place where roller stamps were exchanged. The stamps were acquired and produced by different potting groups. Analysis of the chaîne opératoire and production techniques shows processes of adaptation and emulation associated with the multiple, multiethnic communities during the period from AD 1000 to 1480. Both beads and stamps are linked to identity regalia that were likely used as part of ceremonies taking place in the area of the Rapids, as indicated by the numerous and monumental petroglyphs found on the islands.

The discovery of glass crucible fragments with the remains of semi-finished glass at Ile-Ife, Nigeria, has provided the first evidence for the existence of autonomous glass production in sub-Saharan Africa.

Recent excavations at the site of Igbo Olokun in the Yoruba city of Ile-Ife, in south-western Nigeria, have shed light on early glass manufacturing techniques in West Africa. The recovery of glass beads and associated production materials has enabled compositional analysis of the artefacts and preliminary dating of the site, which puts the main timing of glass-working between the eleventh and fifteenth centuries AD. The results of these studies suggest that glass bead manufacture at this site was largely independent of glass-making traditions documented farther afield, and that Igbo Olokun may represent one of the earliest known glass-production workshops in West Africa.

A mathematical multi-zone ice accretion model used in the numerical simulation of icing on airfoil surface based on three water states, namely, continuous film, rivulets and beads is studied in this paper. An improved multi-zone roughness model is proposed. According to the flow state of liquid water and film flow, rivulets flow governing equations are established to calculate film mass distribution, film velocity, rivulet wetness factor and rivulet mass distribution. Force equilibrium equations of droplet are used to establish the critical conditions of water film broken into rivulets and rivulets broken into beads. The temperature conduction inside the water layer and ice layer is considered. Using the proposed model ice accretion on a NACA0012 airfoil profile with a 4° angle of attack under different icing conditions is simulated. Different ice shapes like glaze ice, mixed ice and rime ice are obtained, and the results agree well with icing wind tunnel experiment data. It can be seen that, water films are formed on the surface, and heights of the films vary with icing time and locations. This results in spatially-temporally varying surface roughness and heat transfer process, ultimately affects the ice prediction. Model simulations indicate that the process of water film formation and evolution cannot be ignored, especially under glaze ice condition.

In 2010, the largest find of exquisite gilded silver brooches ever made in Scandinavia came to light during a metal detector survey in a small fort on Öland in the Baltic Sea. It consisted of five hoards buried in five different houses within the fort. The brooches were of the Dreiknopfbügelfbeln/radiate-headed and relief types. Three of the hoards also contained large quantities of beads and pendants, some quite exclusive and rare. In addition, the upper part of another relief brooch probably belonged to a sixth hoard ploughed up in the late nineteenth century. In 2011, Kalmar County Museum excavations at the site of these hoard finds also revealed the traces of a massacre. Though a connection between the deposition of the hoards and the massacre is plausible, several elements suggest that the deposits are ritual in character and unrelated to the attack on the fort. The regular placing of the hoards in the right corner inside the entrance of the houses suggests ritual acts, and the composition of the hoards demonstrates that the deposits are symbolic. We conclude that the hoards and the brooches are props belonging to the interior of the forts and to activities conducted inside them; they may have been worn by some women during rituals. Why these hoards were left in the Sandby fort is, however, no doubt related to its destruction.

Mining has commonly been thought of as hard manual labour undertaken by the lower echelon of a hierarchical society, but was this always the case? Recent excavations of the variscite mines at Gavà have revealed burials contemporary with the peak of mining activity that represent a community of miners exploiting the subterranean resources for trade and manufacturing variscite beads with a nuanced symbolism. Skeletal evidence demonstrates the physicality of mining while grave goods reveal a community that worked collectively to mine, manufacture and trade goods, with miners themselves benefiting from the fruits of their labours.

The use of marine shells in the manufacture of bracelets and beads is a well-attested phenomenon of the Neolithic and Chalcolithic periods of Western Anatolia, the Aegean, and the Balkans. The site of Gökçeada-Uğurlu, located on an island in the Aegean between mainland Europe and Anatolia, shows evidence for the manufacture and use of bracelets and beads from Spondylus and Glycymeris shell. This use of personal ornamentation ties the site into one of the widest material culture production and trade networks of the prehistoric period. This article explores the possible role of, and influences on, an island site within the wider context of long-distance exchange. The life history of shell products is investigated, showing that a bracelet may have gone through processes of transformation in order to remain in use. The article also questions whether there was a relationship between the use of marine shell and white marble from which similar products were manufactured in contemporary contexts. In its conclusions the article addresses the value of materials and of the personal ornaments they were used to make.

Academic interest in the elaborate bead assemblages recovered from graves of the Western Zhou elite has grown in recent years. Beads and beaded ornaments have been seen as both markers of external contact and evidence of change in the Zhou ritual system. Recent study of these bead assemblages, however, indicates that they may also have reflected shifting political circumstances. The use of different bead materials and forms suggests a trend to centralised production and control of manufacture, particularly from the later tenth century BC. The authors correlate a move towards readily manufactured materials with evidence for widespread elite intermarriage, and consider a possible tension between production and the socio-political strategies of the Zhou court.

The south-east coast of Africa in the later first millennium was busy with boats and the movement of goods from across the Indian Ocean to the interior. The landing places were crucial mediators in this process, in Africa as elsewhere. Investigations at the beach site of Chibuene show that a local community was supplying imported beads to such interior sites as Schroda, with the consequent emergence there of hierarchical power structures.

From an analysis of over 3,000 beads and pendants from seven contemporary Late Neolithic/Copper Age (3500–2500 BC) sites in the Portuguese Estremadura, two dominant patterns emerge: (1) most beads show a high degree of standardization in terms of size and shape and are made from local materials; and (2) a minority are made from non-local, rare, and visually distinctive materials (e.g.variscite, ivory), and are less standardized and more labour-intensive. The emphasis on a wide-range of materials suggests that uncommon ornaments may have functioned as ‘value added' materials with special significance, enhancing potential design combinations. Material preferences for beads, bracelets, pendants, plaques, and ground stone tools (da Veiga Ferreira 1951; Lillios 1997, 2008) appear to mirror other Western Mediterranean raw material preferences for ornaments and other polished stone objects (Goñi Quinteiro et al. 1999; Harrison and Orozco Köhler 2001; Pascual Benito 1998; Skeates 2010; Teruel Berbell 1986) suggesting that the Estremadura participated in aspects of a wider system of shared symbolic values.

Presented here is the so far unique discovery and interpretation of an occupation area directly associated with Upper Palaeolithic cave paintings. The paintings, of red spots and hand stencils, overlook two hearths with selected flints. There were also fragments of stalactite, deduced by analysis and experiment to be waste products from the manufacture of beads. The authors deduce that the hearths and their assemblage complement the ritual nature of the paintings.

Secondary dispersal is an important stage in the life cycle of tree species, determining the fate of a high proportion of all seeds. For small-seeded species both physical and biological processes may influence the secondary fate of seeds, however the relative importance of these processes is not well known. Seeds of the pioneer tree species Cecropia insignis (seed mass 0.5 mg), Trema micrantha (2.5 mg) and Apeiba aspera (14.2 mg) and five types of artificial seed were sown in understorey, treefall-gap and large-gap sites on Barro Colorado Island, Panama, during the wet season of 2005. Sowing areas were excavated after periods up to 26 d and cores divided into depths of 0–5, 5–10, 10–20 and 20–50 mm to allow high-resolution estimation of the rate and amount of burial and displacement of seeds. Over 26 d, 2.8% of artificial seeds were buried to a mean depth of 10.5 mm below the soil surface and 43.9% of unburied seeds displaced laterally >5 cm. Significantly more (87.9% and 80.9%) seeds of Cecropia insignis and Trema micrantha were displaced than artificial seeds of similar mass, size and density. A generalised linear model suggested that burial mostly occurred within 15 d, while displacement occurred continuously up to 26 d. The dominant cause of displacement and burial was probably rainfall, while seed removal by ants may also have contributed to displacement.

Why did Palaeolithic people wear shells, and why was the practice so widespread in the world? The authors' own researches in Western Australia show that specific marine shells were targeted, subject to special processes of manufacture into beads and that some had travelled hundreds of kilometres from their source. Whether they were brought in land by the manufacturers, or by specially ornamented people, these beads provided a symbolic language that somehow kept the early peoples of Australia in touch with the sea.

The authors report the discovery of a cemetery of richly furnished graves in the western desert of south Egypt. Artefacts, burial rites and radiocarbon dates relate the cemetery to pastoralists practising transhumance in the later Neolithic period. The first such cemetery to be investigated, its cultural affiliations offer a pre-echo of what would become the Egyptian civilisation.

From their research in Jordan, the authors show that the appearance of early farming and herding communities in western Asia coincided with a large expansion in stone bead production. This reflects a new social role for personal ornament.