Rock art - paintings, and pecked or engraved images on rocks, whether in caves, shelters, or in the open-air - exists in all but a couple of countries of the world [Bahn, 1998], It spans a period from at least 35,000 years ago to historic times, comprises many millions of images from hundreds of thousands of sites, and thus constitutes the vast majority of the world's art, and art history. It is a phenomenon that has seen a huge upsurge of interest in the last few decades, with not only numerous publications and conferences, but also a proliferation of calendars, T-shirts, mugs, jewellery, and garments bearing rock art images. Many people who are famous for other things have worked on or published rock art - for example, scholars such as Mary Leakey or authors like Joy Adamson or Erle Stanley Gardner. Rock art studies have always been the domain of the “amateur” as well as the “professional”, and amateurs remain of huge importance in this field. Indeed, most of the principal rock art organisations, along with their journals, were created by, are run by, and consist largely of amateur enthusiasts who include some of the world's foremost specialists. The growing popularity of the art brings an ever-increasing risk of pollution, damage, and vandalism, as well as outright thefts of wall or cave images. The rock art associations are dedicated to the discovery, recording, and conservation of rock art, and play a major role in striving to teach schoolchildren and adults alike about the incalculable importance of this irreplaceable, universal heritage and about the need to respect and protect it.

According to Lippmann (1977, 1982) wide compositional variations and excess enthalpies of mixing calculated with electrostatic models imply that clay minerals of variable composition are dis-equilibrium solids. However, recent ATEM analyses of illite samples indicate compositional homogeneity of single illite grains and limited compositional variations in sedimentary basins. Moreover, Lippmann's electrostatic model may be inadequate inasmuch as it neglects polarization energy which is known to be a significant component of lattice energy even in dominantly ionic structures. Contrary to the assumptions of Lippmann, I/S minerals have also been shown to undergo Ostwald ripening.

May et al. (1986) reported that smectites do not reversibly control equilibria and further argued that conceptual and experimental deficiencies inherent in the solubility method prevent the attainment and demonstration of equilibrium in experiments with complex aluminosilicates of variable composition. However, equilibrium may be assumed if: (1) steady states are approached from both under- and over-saturation, (2) the slopes of univariant lines representing mineral-solution equilibria are rational over a wide range of solution compositions and temperature, and (3) results are reproducible in experiments of long duration. Recent solubility studies of smectites, chlorites, and illites meet these criteria indicating that clay minerals of variable composition are true phases capable of attaining equilibrium.

Being condemned (or chosen?) to be “the missing link” on its way to perfectibility (or redemption?) - half animal/half human - we always need in some way or another the transcendence of a Utopian Vision. It therefore comes as no surprise that most of the essays in this issue, reflecting a vision of the world today, are openly or covertly concerned with Utopian expectations. Hence, it might be worthwhile to trace the origins and reflect in flashbacks - following the pioneering technique of the French film-maker Alain Resnais - a story of the Utopian Vision.

Takovite, Ni6Al2(OH)i6CO3-5H2O, with molar Ni/Al ratios of 2.5 and 3 is prepared by precipitation at pH levels of 7 and 10, periods of reaction of 3 and 20 hr, and calcination temperatures varying between 120° and 8 5 3°C. The quantity of reduced Ni is determined as a function of the calcination temperature, and the solid phases remaining after reduction are determined with XRD. The Ni/Al ratio, pH of precipitation, and calcination temperature are important preparation conditions. A precursor of a Ni/Al ratio of 2.5 precipitated at a pH-level of 10 exhibits on reduction metallic Ni particles of about 15 nm irrespective of the drying or calcination temperature. After reduction, a considerable amount of NaAlO2 is present. Metallic Ni particles of 6 nm are present in a reduced precursor of Ni/Al ratio of 2.5 precipitated at a pH-level of 7. The size of the Ni particles present in a reduced precursor of Ni/Al ratio of 3 precipitated at a pH-level of 10 rises from 4–8 nm to 16 nm after calcination at temperatures increasing from 120° to 853°C. The last precursor contains much less sodium, and shows after reduction a disordered NiO phase containing some alumina. Especially, the takovite with the molar Ni/Al ratio of 2.5, thoroughly washed to remove Na, and calcined at T ≤ 260°C before reduction of Ni provides a promising catalyst for the production of hydrogen-carbon monoxide flows out of methane and steam.

The matrix of the Pliocene volcaniclastics from the Akrotiri area of the Santorini island (Greece) is dominated by clinoptilolite. Smectite, occasionally illite-smectite, opal-CT, cristobalite and mordenite are also present. The clinoptilolite-rich samples were heated at 460 and 560°C for 12 h and the reductions in the intensity of the 020 diffraction peak were measured. Electron microprobe analysis (EMPA) was then used to study the chemical composition of the clinoptilolite. Statistical analysis proved a strong and quantifiable relationship between the reduction of the 020 diffraction peak of the clinoptilolite and the Na/K ratio. A representative set of microprobe analyses of clinoptilolite was performed before any correlation with thermal behavior was attempted. The presence of K in the structure of clinoptilolite as well as its relationship with Na are most important in the thermal behavior of clinoptilolite.

The European community that is in the process of being created is still searching for its history. For a few years now, the publishing market, which has been attempting - under the heading of ‘European history’ - to construct a shared past for a present that we now have in common, has been mushrooming. This communal experience is indisputably gaining ground (though more slowly and controversially than some well-known optimists hoped): it is promoted by freedom of movement within the European Union, by the effect of tourism, which some time ago ceased being reserved only for the elite, by the availability everywhere of products that, a few years back, typically represented a certain type of national styles of consumption, and finally by the unifying influence of the media. To the extent that closer relations between the inhabitants of the ‘old world’ run in parallel with the attempt to create institutions to regulate these common goods, and to protect against movements of people from other areas with their own sets of values, a combination of powerful ingredients is in place that leads one to anticipate a strengthening of ‘European’ identity. It is well known in research into identity that history plays an important part in its construction. And indeed historians from European countries have set themselves the task of jointly putting together a school textbook in which presentations that might otherwise focus on national character and be likely to offend neighbours will be harmonized. Others are looking at ways of celebrating memory (places of memory) that are intended to stimulate European rather than national memory. In addition, German and French historians met a while ago, in the little place of Genshagen near Berlin, with the intention of identifying events that would be suitable for European celebrations, in that they would not be connected with events that one of the participants might be ashamed of, or refer directly to a victory of one over another. But to anyone who studies the history of the two neighbours separated only by the Rhine, it quickly becomes clear that there is not a lot of space left in the calendar for activities that would found a common tradition.

Introduced in the context of developmental psychopathology by Cicchetti and Rogosh in the Journal, the current paper incorporates the principles of equifinality and multifinality to support the use of tiered models to prevent the development of emerging child psychopathology and promote school readiness in early childhood. We use the principles of equifinality and multifinality to describe the limitations of applying one intervention model to address all children presenting with different types of risk for early problem behavior. We then describe the potential benefits of applying a tiered model for having impacts at the population level and two initial applications of this approach during early childhood. The first of these tiered models, Smart Beginnings, integrates the use of two evidenced-based preventive interventions, Video Interaction Project, a universal parenting program, and Family Check-Up, a selective parenting program. Building on the strengths of Smart Beginnings, the second trial, The Pittsburgh Study includes Video Interaction Project and Family Check-Up, and other more and less-intensive programs to address the spectrum of challenges facing parents of young children. Findings from these two projects are discussed with their implications for developing tiered models to support children’s early development and mental health.

Meme, Mneme, Mnemosyne: two neologisms, one dating from 1976 and the other from 1904, and the mythical figure personifying Memory from the time of the Titans - a strange primordial deity that the imagination brought forth even before the time of mortal men began. Her name is all that survived through the ages, yet this fleeting presence among the gods was just as consequential as a major figure like Prometheus. Could she have been conceived of as an indispensable condition for human beings to usher in the reign of culture?

The sorption properties of carbon-composite materials based on montmorillonite and hydrotalcite matrices have been studied using nitrogen adsorption isotherms and inverse gas chromatography. Carbon composite materials derived from both types of inorganic precursors contain pore structure accessible for adsorbate molecules. Adsorption capacity per unit mass of these composite adsorbents is larger in the case of hydrotalcite than in montmorillonite-based materials. Exposing these materials to ambient conditions results in their hydration. Subsequent water removal by heating under vacuum increases nitrogen adsorption capacity, which is explained by the opening of the adsorption space. The water content of hydrated samples and its effect on adsorption capacity is greater for the case of hydrotalcite-based materials. No direct relationship between carbon content and adsorption properties of the materials studied is observed.

Who are we? Never have so many of us asked this question, nor so few been able to answer it. What is happening to us? Already we miss those who are not asking the question along with us.

We all were sure of ourselves in our respective groups - some aggressive, others tolerant - but sure of being these ones and not those ones as we crossed paths with others or with us, in business and in war, and who were always ready to tell us which of all of them we were.

When Captain Binger traveled the Niger bend between 1887 and 1889, he saw numerous villages that had been drained of their lifeblood or left in ruins by violent conflicts that had left their mark in the form of fortifications. Above all he was struck by the region's depopulation, which threatened to compromise the potential for colonial exploitation of the country. But these conditions did not prevail throughout the entire area. Prosperous towns were engaged in trade, war parties were living in ostentation, and rulers were collecting taxes from their subjects. The misery of the peasants’ lives contrasted with the opulent luxury of the courts and caravansaries. The black slave trade, and slavery itself, did not exert a uniform effect upon all of Africa.

The reactivity of basal surfaces, steps and edges of muscovite was studied by imaging surface precipitates of PbCl2 using atomic force microscopy (AFM). We reacted PbCl2 solution with freshly cleaved muscovite surfaces and found that PbCl2 precipitates were formed on the basal surfaces, steps and edges. It was observed that PbCl2 precipitated preferentially along the steps compared to the basal surfaces and that PbCl2 precipitates at multiple-layer edges were needle-shaped and oriented in different directions. One of the muscovite samples we cleaved had muscovite fragments sitting on the freshly cleaved surfaces. These fragments resulted from previously formed cracks. Thus, we were able to compare the reactivity of the weathered surfaces with that of freshly cleaved surfaces. It was found that PbCl2 was not precipitated along the edges of previously cracked muscovite fragments. These results clearly demonstrated that the edges of freshly cleaved muscovite are the most reactive surface sites, whereas the edges of weathered muscovite are not as reactive. We believe that the surface reactivity of the edges of freshly cleaved muscovite is likely due to terminal or Al-OH1/2− groups on these crystalline surfaces, which favor adsorption of Pb2+ ions and the subsequent nucleation and precipitation reactions. We also investigated the effect of drying rate on the morphology of the surface precipitates. Fast drying resulted in a nearly complete covered surface with a leaflike morphology, whereas slow drying resulted in more isolated surface clusters.

Vermiculite crystals from Santa Olalla, Spain, were intercalated with tetramethylammonium (TMA) after Na saturation. The resulting TMA-vermiculite showed near perfect 3-dimensional stacking order with cell parameters of a = 5.353(1) Å, b = 9.273(2) Å, c = 13.616(6) Å, β = 97.68(3)°, and space group C2/m, which indicated a 1M polytype. Single crystal X-ray refinement (R = 0.073, wR = 0.082) located the central atom (N) of the TMA (occupancy at 0.418) and the C atom of 1 methyl group (occupancy at about 0.35). The TMA is offset from the center plane between 2 silicate layers by 1.52 Å, and the methyl group is keyed into the silicate ring of the adjacent silicate layer. This arrangement constrains the positions of the C atoms of the other methyl groups to an opposing plane parallel to the oxygen basal plane. Associated H2O is randomly located between the TMA pillars, and no scattering from these molecules was observed. The calculated height of the TMA molecule is shown to be 4.15 Å.

Steric and electrostatic arguments suggesting that adjacent TMA molecules must alternate apex directions (±c) allow for a description of the local TMA arrangement. This model involves the keying of TMA molecules laterally, thereby explaining why perfect 3-dimensional stacking occurs. The offset of TMA from the center of the interlayer region produces a cavity suitable as an adsorption site for small molecules, such as benzene, which is consistent with the higher than expected adsorption of these molecules in TMA-smectites of high layer charge. This offset also explains the easy expandability of TMA-clays, since only very weak interactions occur between TMA and 1 adjacent silicate layer, thereby allowing molecules to enter the interlayer.

Infrared (IR) spectroscopy, in combination with magnetic methods, was used to study the thermally induced transformation of synthetic lepidocrocite (γ-FeOOH) to maghemite (γ-Fe2O3). Magnetic analyses showed that the thermal conversion began at about 175°C with the formation of superparamagnetic maghemite clusters. The overall structural transformation to ferrimagnetic γ-Fe2O3 occurred at 200°C and was complete around 300°C. At higher temperatures, the maghemite converted into hematite (α-Fe2O3). Observation of the transformation from γ-FeOOH to γ-Fe2O3 using variable-temperature IR spectroscopy indicated that dehydroxilation on a molecular level was initiated between 145°C and 155°C. The lag time between the onset of the breaking of OH bonds and the release of H2O from lepidocrocite around 175°C can be explained by diffusive processes. Overall dehydroxilation and the subsequent breakdown of the lepidocrocite structure was complete below 219°C. The comparison of the magnetic and IR data provides evidence that the dehydroxilation may precede the structural conversion to maghemite.

Superstars are not by accident a conspicuous phenomenon in our culture, but inherently belong to a meritocratic society with mass media, free enterprise, and competition. To make this contention plausible I will use Caillois's book, Man, Play and Games, to compare the mechanisms underlying the superstar phenomenon with a special kind of game, as set out by Caillois. As far as I know, Caillois's book is not quoted in the literature dealing with income distribution theories, although the comparison with play and games is, for limited purposes, interesting. In play and games we find almost all elements which play a role in theories of just income distribution: equality of opportunity, chance, talent, competition and skill, reward, entitlement, winners and losers, etc. These are not chance similarities, for “… games are largely dependent upon the cultures in which they are practised. They affect their preferences, prolong their customs, and reflect their beliefs … One … can … posit a truly reciprocal relationship between a society and the games it likes to play”. Moreover, as we will see, superstars combine the four basic characteristics of play that make their activities a special kind of play.