Rebecca Davis

Along Lake Victoria, women fishmongers often engage in transactional sex with fishermen — a practice that contributes to Kenya's high rate of HIV. One group is challenging that convention.

After years of being beaten up, this teen decided to take justice into his own hands. A school district in Oregon showed him a better way to solve his problems.

Melanoma can be a deadly skin cancer, but 10 years ago, biologist Jim Allison figured out a way to tweak the body's immune system to go after those malignant cells. Some patients are now cancer-free.

When Jimmy Carter said his advanced melanoma was gone, he credited immunotherapy, treatments that harness the immune system to fight cancer cells. This idea dates back to a 19th-century doctor.

She's a typical teen — blue nails, loves Coldplay. But she believes she won't be able to build a life in her homeland.

Fatmeh is one of hundreds of thousands of children who have fled Syria with their families. In Lebanon, she works in the fields up to 14 hours a day, clinging to her dream of going to college.

One of the most important medical advances may also be the simplest: hand-washing. It's the best defense against spreading disease. And its power was discovered long before anyone knew about germs.

In the storytelling series Mortified, performers dig through old diaries and love notes to find a glimpse of their ridiculous, self-centered, pathetic and comical adolescent lives. Then they get onstage and share it with an audience of complete strangers.