When her daughter was born two-and-a-half years ago, Mary Goldsberry-Troyer eagerly watched for the typical developmental milestones in her firstborn. She noted when Vivi smiled, rolled over, and took ...

It has happened to many of us. While in the middle of work, a study session or just spending time with friends, your eyelid flutters for no apparent reason. At first, it may be nothing more than a ...