But by talking prematurely about tax cuts, Mr Duncan Smith is only giving ammunition to Tony Blair and confusing what should be his party's most important message: that the Conservatives' newfound decentralist approach is superior to the philosophically flawed command-and-control methods of the government.

ECONOMIST: Bagehot

These diseases, ranging from dengue fever and malaria to West Nile virus and yellow fever, are the cause of millions of deaths worldwide, yet control methods have become a dilemma due to the development of resistance by mosquitoes and increased concern about health and environmental hazards.

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The bottom line is that the use of reliable birth control is the best way to prevent an unintended pregnancy, but the fact is that unprotected sex does occur and sometimes birth control methods do fail.

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However, the development of reproducible methods to control stem cell growth and differentiation is still a challenge and major studies are needed before stem cells can be widely used for therapeutic purposes.

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In six cases, it was possible to compare the effect of the new methods with a control area, where levels of disorder and police resources were similar.

ECONOMIST: Policing

The Denominazione di Origine Controllata (DOC) outlined strict control on yields, grape varieties and production methods.

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Currently, the methods used to assess an infection by America's Centres for Disease Control and Prevention lag an outbreak by a week or two.

ECONOMIST: Epidemiology: Infectious personalities | The

Simon Pope, a spokesman for the World Society for the Protection of Animals in London, said his group would like to know whether other rat-control methods that don't involve toxic substances were investigated and what assessment has been made about the pesticides on the birds.

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