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The authors discuss the "insufficient milk syndrome" associated with the decline of breastfeeding in the urbanizing world and offer a biocultural model to demonstrate its complex transcultural etiology. Rejecting the common explanation of insufficient milk reports as rationalizations of women no longer interested in breastfeeding, the authors suggest that the syndrome stems from the spread of nonbiological breastfeeding patterns in industrializing, urbanizing societies. This paper describes the syndrome and its effects on infant feeding patterns, explains the biocultural model, and considers some possible interventions to affect its course.

In this paper, we study the defensibility of large scale-free networks against malicious rapidly self-propagating code such as worms and viruses. We develop a framework to investigate the profiles of such code as it infects a large network. Based on these profiles and large-scale network percolation studies, we investigate features of networks that render them more or less defensible against worms. However, we wish to preserve mission-relevant features of the network, such as basic connectivity and resilience to normal nonmalicious outages. We aim to develop methods to help design networks that preserve critical functionality and enable more effective defenses.