Needle exchange programs, like this one in Portland, Maine, offer free, sterile syringes and needles to drug users. The programs save money and lives, health officials say, by curtailing the spread of bloodborne infections, such as hepatitis and HIV. Robert F. Bukaty/AP hide caption

itoggle caption Robert F. Bukaty/AP

Frito-Lay reformulated Flamin' Hot Cheetos, a perennial favorite among school kids, to meet new federal "Smart Snack" rules for schools. Meredith Rizzo/NPR hide caption

itoggle caption Meredith Rizzo/NPR

Melinda Townsend-Breslin holds a photo showing her and her mother standing in the parking lot of a favorite thrift store in 2013. William DeShazer for NPR hide caption

itoggle caption William DeShazer for NPR

A health inspection grade is posted outside a Manhattan eatery. In several cities, Yelp users can now find out how a restaurant scored on its health inspection well before they walk through the door. Mario Tama/Getty Images hide caption

itoggle caption Mario Tama/Getty Images

Schedule 2 narcotics Morphine Sulfate, OxyContin and Opana. Liquefied as an injectable, Opana has been connected to a major abuse problem in rural southern Indiana. Rich Pedroncelli/AP hide caption

itoggle caption Rich Pedroncelli/AP

The H1N1 swine flu virus kills some people, while others don't get very sick at all. A genetic variation offers one clue. Centre For Infections/Health Pro/Science Photo Library/Getty Images hide caption

itoggle caption Centre For Infections/Health Pro/Science Photo Library/Getty Images