Carl Moore, a former helicopter mechanic, was diagnosed with ALS 20 years ago. He has had unusual longevity for someone with ALS but expects someday to rely on his wheelchair and speech-generating device. Justin Steyer/KPLU hide caption

itoggle caption Justin Steyer/KPLU

Sophia Jarvis, 4, of Berkeley, Calif., is one of the few children diagnosed with the polio-like disease, which left her arm paralyzed. She attended a press conference Monday at Stanford University with her dad, Jeff. Martha Mendoza/AP hide caption

itoggle caption Martha Mendoza/AP

Joscelyn Benninghoff, 10, goes over the results of her cholesterol test with her mother Elizabeth Duruz (right) and Dr. Elaine Urbina at Cincinnati Children's Hospital in 2011. Al Behrman/AP hide caption

itoggle caption Al Behrman/AP

In the Institute for the Unsalvageable in Sighetu Marmatiei, Romania, shown here in 1992, children were left in cribs for days on end. Tom Szalay hide caption

itoggle caption Tom Szalay

Kids as young as 13 purchase e-cigarettes, or "vape pens," online, where independent sellers don't necessarily ask a buyer's age. Jenny Lei Bolario/Youth Radio hide caption

itoggle caption Jenny Lei Bolario/Youth Radio

Mammograms are a key screening tool for breast cancer. But critics say they're not good enough. Salih Dastan/iStockphoto hide caption

itoggle caption Salih Dastan/iStockphoto

Small but costly: Dozens of mosquito species carry West Nile virus in the U.S. Darren McCollester/Getty Images hide caption

itoggle caption Darren McCollester/Getty Images