Rebecca Davis
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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.
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She's a typical teen — blue nails, loves Coldplay. But she believes she won't be able to build a life in her homeland.
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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.
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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.
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If you think that an artificial eye looks like a big glass marble, you're not alone. And you're wrong. We visit the people who made a prosthetic eye for a 5-year-old boy who lost an eye to cancer.
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Scientist Adam Steltzner worries about whether the Mars rover landing equipment he helped design will work. But in his garden, where he approaches things like the engineer he is, he is firmly in charge.