In this illustration, new viruses emerge from an infected human throat cell. When you get the flu, viruses turn your cells into tiny virus factories that help spread the disease.
Indonesian soldiers search for survivors in a crumbled building in Padang, Sumatra Thursday. Officials said that 376 people have already died and over 400 were listed as seriously injured.
Adek Berry/AFP/Getty Images
Martha Martin of Durham, Maine, works three jobs and still can't keep up with her family's medical bills. She has medical insurance, but she and her husband can't make all of the payments.
Emilie Sommer for NPR