Staying physically active is important for everyone, even for adults who cope with disabilities. And a new report suggests that many of these adults aren't getting enough activity.

While the chances of developing age-related macular degeneration or Alzheimer’s disease increase with age, older adults who develop one of these diseases are not necessarily at a greater risk of developing the other.

Stem cell research holds the promise of changing the entire field of medicine. But research has been hampered because scientists haven't found a way to produce enough cells that can be studied safely.