STD cupcakes: From Two Little Cats Bakery in Cambridge & Hertfordshire, these chocolate cupcakes feature symptoms of sexually transmitted diseases, including gonorrhea, syphilis, genital warts, chlamydia and HIV. Eat Your Heart Out 2012 hide caption

Inglewood High School cheerleaders perform in front of the Space Shuttle Endeavour as it is transported through the streets of Inglewood and Los Angeles on October 13. ROBYN BECK/AFP/Getty Images hide caption

Doctors need to prescribe exercise to patients who don't get enough exercise, a Mayo Clinic expert says. iStockphoto.com hide caption

A mobile clinic set up to test students for HIV is parked near Madwaleni High School in Mtubatuba, KwaZulu-Natal, South Africa on March 8, 2011. Parts of the South African province have HIV rates that are more than twice the national average. Stephane de Sakutin/AFP/Getty Images hide caption

Opana is the latest painkiller that's become popular with drug abusers. Thomas Walker/Flickr hide caption

Health care workers in South Africa speak to residents during a door-to-door AIDS awareness campaign, part of a series of prevention efforts that has helped lower the country's HIV infection rate. Mujahid Safodien /Reuters /Landov hide caption

HIV patient Darnell Hollie, 47, talks to her doctor Monica Gandhi (right) at San Francisco General Hospital. Her path from drug addict to model patient was "a lot of work, but if you want it, it's there for you," Hollie says. Richard Knox/NPR hide caption

Researchers say that when temperatures rise above 95 degrees, a fan might make you even hotter, and maybe even sick. iStockphoto.com hide caption

How risky is a drink during pregnancy? iStockphoto.com hide caption

Data from the Twins Early Development Study shows areas in the U.K. where the effect of environmental factors, shown in pink, trumps the influence of genes, shown in blue, and vice versa. TEDS hide caption

A woman pours two tablets into her hand from a pill bottle. iStockphoto.com hide caption

A makeshift latrine hangs over the water at the edge of Cite de Dieu, a slum in Port-au-Prince, Haiti. John W. Poole / NPR hide caption

A Pakistani man wheels Jamshid, an 8-year-old girl with polio, around the outskirts of the capital Islamabad last July. Behrouz Mehri/AFP/Getty Images hide caption

Gilead Sciences' Truvada is a step closer to being approved as a way to prevent HIV infection. Paul Sakuma/AP hide caption