Paul Rider runs on Mulholland Drive in Los Angeles, March 25, 2011. Researchers say a moderate running regimen is actually beneficial for the joints of people with healthy knees.
Dennis J. Provost for NPR
This tiny telescope gets implanted in one eye and magnifies the image to make up for "holes" in the person's vision. It can greatly improve sight for some people with age-related macular degeneration.
Courtesy VisionCare Ophthalmic Technologies
Many people with a hoarding anxiety disorder need to take baby steps in order to cope with organization — like cleaning a bit at a time, rather than getting rid of everything at once.