Eusociality is the most successful animal social system on earth. It is found in many social insects, a few crustacean species, and only three vertebrates: two African naked mole rats and human beings. Eusociality, so unusual for a vertebrate, is one of main factors leading to human beings becoming the most successful land vertebrate on earth by almost any measure. We are also unique in being the only land vertebrate with religions. Could the two be related? This article will present (...) evidence, illustrated primarily with Judaism and Christianity, that these two seemingly unrelated social systems – eusociality and religion – that correlate temporally in our evolution, are possibly related. Evidence will also be presented that a non-reproducing exemplar caste of celibate clergy was a eusocial-facilitating aspect of religion in western social evolution. (shrink)

Several theorists have tried to model anorexia on Wasser and Barash’s (1983) “reproductive suppression model” (RSM). According to the RSM, individual females adaptively suppress their reproductive functioning under conditions of social or physiological stress. From this perspective, mild anorexia is viewed as an adaptive response to modern conditions; more severe anorexia is viewed as an adaptation gone awry. Previous models have not, however, examined the full richness of the RSM. Specifically, Wasser and Barash documented not only self-imposed reproductive suppression, but (...) also manipulative reproductive suppression of subordinate females by dominants. I propose that the modern “epidemic” of anorexia is explained neither by adaptive self-suppression nor by environmental mismatch (an adaptation gone awry); I propose that the “epidemic” levels of anorexia seen in modern western society are a direct consequence of intrasexual competition, the scope of which has been enhanced by the power and reach of modern communications media. According to this perspective, anorexia, even in its mild forms, is a manipulative strategy imposed on subordinates by dominants. Anorexia is, in both senses, a “losing” strategy. (shrink)

In the present study a historiographical review is performed according to the main hypotheses have been proposed from a Darwinian point of view to analyse religion. First, the basic pillars of Darwinian theory are analysed: variation, inheritance and selection. Keeping in mind these previous ideas, Darwinists theorists have analysed the religion well as neutral phenomenon while exaptation, as a non-adaptive phenomenon from a memetic perspective while anachronism and as an adaptive phenomenon from a single and multilevel standpoint. Finally, a critical (...) review is realised about problems and solutions of each perspective. (shrink)

The effects of grandparent survival on child survival and mean interbirth interval, both independent of and relative to parent survival, were investigated in a historical population. Families for the data set were reconstituted from the parish and census records of Cambridgeshire, 1770–1861. In a logistic regression analysis, only the mother’s and the maternal grandmother’s survival were found to be significant predictors of child survival. Maternal grandmother’s survival was found to influence child survival both via maternal survival and independent of maternal (...) survival. Grandparent survival was not found to influence mean interbirth interval. These findings are reviewed with respect to other studies of grandmothering, the Grandmother Hypothesis, and the evolutionary significance of human female postreproductive lifespan. (shrink)