The purpose of this article is to present several immediate consequences of the introduction of a new constant called Lambda in order to represent the object ``nothing" or ``void" into a standard set theory. The use of Lambda will appear natural thanks to its role of condition of possibility of sets. On a conceptual level, the use of Lambda leads to a legitimation of the empty set and to a redefinition of the notion of set. It lets also clearly appear (...) the distinction between the empty set, the nothing and the ur-elements. On a technical level, we introduce the notion of pre-element and we suggest a formal definition of the nothing distinct of that of the null-class. Among other results, we get a relative resolution of the anomaly of the intersection of a family free of sets and the possibility of building the empty set from ``nothing". The theory is presented with equi-consistency results . On both conceptual and technical levels, the introduction of Lambda leads to a resolution of the Russell's puzzle of the null-class. (shrink)

This article is about an intervention introducing prehistoric life in primary education. Its objectives were to foster openness and interest for prehistory and archaeology, as well as content knowledge and conceptual learning with a focus on four main facets: basic knowledge about prehistoric life; conceptual learning/change regarding prehistory; learning about archaeologists and archaeology as a scientific discipline; and learning about interactions of archaeology and other disciplines. Students participated in two workshops about the creation of a prehistoric object, highlighting the close (...) interaction between the natural sciences and humanities within archaeology. The workshop emphasised dialogue between students, teachers and researchers, as well as active participation by the students. The educational effects of the workshops were studied using a pre-post design. Results show that the workshops had sizeable positive effects on both affective and cognitive variables. The appreciation of the workshops ranged from ≈ 70 to 90% for interest, perceived educational value and further aspects. We also found a positive impact of the intervention on cognitive variables, e.g. for several elements of key knowledge about prehistory. Regarding conceptual learning, we found improved understanding of the link between climate change and long-term changes in wildlife in a given area. A positive impact was also found for the understanding of archaeology encompassing both humanities and the natural sciences. No differences of the various outcomes were found between girls and boys; the workshops appear suitable for both genders. We conclude with a discussion of the interpretation of our findings, of some limitations and possible improvements, and of future perspectives, in particular for further classroom implementation. (shrink)

An in-depth reform of the asylum system took place in Great Britain from the 1830s onwards, under the influence of Dr John Conolly, who succeeded in imposing a new model at Hanwell pauper lunatic asylum, near London, a model that was more respectful of the patients and based on the abandonment of mechanical restraint (non-restraint) combined with occupational therapy. The success of this system at Hanwell, the largest asylum in the country with over a thousand inmates, contributed to the spread (...) of what became a form of psychiatric orthodoxy for the next thirty years. Far from being a strictly medical measure, this reform was anchored in a general reform of poor relief. In this respect, it was in line with the Poor Law of 1834 (inspired by Jeremy Bentham, notably under the aegis of Edwin Chadwick, secretary of the Poor Law Commission). This reform was also part of a more political reflection on the extension of civil and social rights for the working classes, in particular under the... (shrink)