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...World Health Organization (2002), they concluded that in high-income countries nearly half of the total current burden of disease (i.e. the number of years of life lost to disease and the number of years lived with disability as a result of disease) is attributable to unhealthy behaviours such as smoking, alcohol misuse, poor diet and a lack of physical exercise. The term...

...world as a highly complex web of interacting systems which are mutually dependent (perhaps the food chain is the best-known example). When applied to social work, human society is seen as a network, implying that intervention in one part can have dramatic effects on others. The tendency to see such a network as concentric circles (with the individual in the middle and...

...world, other animals – mostly dogs – are being used experimentally to screen human samples for disease; the TB-sniffing rats of Tanzania are the only animal disease-detectives in routine use. When medics first hear about the programme, they are often sceptical about the idea of using rats rather than machines, says Christophe Cox, CEO of Apopo, the Belgian-based...