Global Health

Microsoft founder Bill Gates, his wife Melinda French Gates and British Prime Minister David Cameron at the World Economic Forum on January 28, 2011, in Davos, Switzerland. Johannes Eisele/AFP/Getty Images hide caption

A Dutch man rides his bike by windmills in Kinderdijk, the Netherlands in 2007. Dutch researchers have found that the ability to ride a bike can help doctors distinguish between two similar forms of Parkinson's disease. Evert-jan Daniels/AP hide caption

The next pandemic flu virus could come from pigs, but are we monitoring their health closely enough? Matthias Rietschel/APN hide caption

A boy with symptoms of cholera waits for treatment at the St. Catherine hospital in Cite Soleil in Port-au-Prince on Nov. 10, 2010. Cholera has sickened more than 91,000 Haitians and killed more than 2,000. Ramon Espinosa/AP hide caption

In Oxford, England, people are 16 times more likely to get a particular kind of hip replacement than residents of London. Wikimedia Commons hide caption

Two sisters rest under a mosquito net during a July monsoon rain in Prey Mong kol village in Cambodia's Pailin province. Paula Bronstein/Getty Images AsiaPac hide caption

Children light candles to observe India's first National Mental Health Awareness Day, in New Delhi on Aug. 6. Anupam Nath/AP hide caption

A man looks over a room of cholera victims in Port au Prince, Haiti, Dec. 10. David Gilkey/NPR hide caption

Bacteria like these cause tuberculosis. CDC hide caption

A 10-year-old Somali boy being treated for meningitis in May 2009 at a makeshift clinic in Mogadishu. ROBERTO SCHMIDT/AFP hide caption

Scrubbing too much might be a problem, scientists say. iStockphoto.com hide caption