An urban farmer waters his plants near Bamako, Mali, where the government has set aside nearly 250 acres for market gardens.
donkeycart/Flickr
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A kidney donor is wheeled to an operating room for a transplant at Johns Hopkins Hospital in Baltimore in late June.
Brendan Smialowski/AFP/Getty Images
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A doctor examines chest X-rays at a tuberculosis clinic in Gugulethu, Cape Town, South Africa in late 2007. The number of TB cases that don't respond to both first- and second-line medications is rising worldwide.
Karin Schermbrucker/AP
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A rhesus monkey eats watermelon, provided by zookeepers, at the Kamla Nehru Zoological Gardens in India in May 2012.
Sam Panthaky/AFP/Getty Images
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People wait in line at the Durham County Health Department for the H1N1 flu vaccination in Durham, N.C., in November 2009.
Gerry Broome/AP
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