NPR's Kelly McEvers speaks with Dr. Hans Keirstead, a stem cell research pioneer, about former First Lady Nancy Reagan's legacy as an Alzheimer's research advocate.
A recent poll shows 27 percent of Americans have visited an urgent care center in the past two years. Why? Most cite convenience.
Think you've gone gray from stress? Scientists say they've identified the first gene for gray hair. It accounts for about 30 percent of grays, mostly in lighter colored hair.