People sit near pigeons at a park in Shanghai where more than 30 human cases of bird flu have been reported.
Public health authorities in Taiwan have identified the first human case of a new type of bird flu seen outside China.
The development, while not unexpected, points to the potential spread of a new type of bird flu that has, according to the World Health Organization, sickened at least 108 people and been implicated in 22 deaths.
A child is immunized against polio at the health clinic in a farming village in northern Nigeria. The procedure involves pinching two drops of the vaccine into the child's mouth. For full protection, the child needs three doses, spaced out over time.
Polio is on the verge of being eliminated. Last year there were just over 200 cases of polio, and they occurred in just two remote parts of the world — northern Nigeria and the rugged Afghan-Pakistan border region.
A new $5.5 billion plan being pushed by the World Health Organization strives to eliminate polio entirely, phase out vaccination campaigns and secure polio vaccine stockpiles in case the virus somehow manages to re-emerge.
If the effort is successful, polio would be just the second disease in human history, after smallpox, to be eliminated by medical science.
A maintenance worker looks out over an off-shore wind farm in Liverpool, England in 2008. Some people are concerned about the potential health effects of noise from wind turbines.
Credit Christopher Furlong / Getty Images
The U.S. is embracing wind energy, with wind turbines making up half of the new electricity added to the power grid last year. But a smattering of people who live near the turbines say they're a nuisance — and making them ill.